Multiple Choice Questions
Light: Reflection and Refraction
Practice Questions with Answers
Total 99 questions available
Q. 1
Focal length of plane mirror is
A
negativeB
at infinityC
zeroD
none of theseClick an option to check your answer
Q. 2
In a plane mirror, which layer acts as the reflecting layer :
A
Orange red paint layerB
Glass sheetC
Both (a) and (b) are correctD
Silver layerClick an option to check your answer
Q. 3
When light falls on a smooth polished surface,
most of it?
A
Is refracted into the second mediumB
Is reflected in the same directionC
Is reflected in different directionD
Is scattered in all directionClick an option to check your answer
Q. 4
A thin plane mirror :
A
Transmits lightB
Reflects lightC
Refracts lightD
None of theseClick an option to check your answer
Q. 5
Foam of soap always appears white as
A
Is actual property of the substanceB
it reflects light of all wavelengths.C
Its wavelength changesD
it absorbs red portion of the visible lightClick an option to check your answer
Q. 6
The persistence of vision of the eye is :
A
1/26 secondB
1/100 secondC
1 /16 secondD
1/5 secondClick an option to check your answer
Q. 7
The mirror used by ENT specialists is
A
Concave mirrorB
Convex mirrorC
Plano-convex mirrorD
Plane mirrorClick an option to check your answer
Q. 8
Ray nature is confirmed by the phenomenon of :
A
both A and BB
reflectionC
refractionD
none of theseClick an option to check your answer
Q. 9
Example of transparent medium is :
A
Distill waterB
GlassC
AirD
All are correctClick an option to check your answer
Q. 10
We can see the things around us due to :
A
Irregular reflectionB
Regular reflectionC
Mixed reflectionD
Specular reflectionClick an option to check your answer
Q. 11
Which of the following statement is incorrect?
A
The bending of a ray of light on passing from different media to one is called reflection.B
The phenomenon of splitting of white light into seven constituent colours is known as the dispersion of light.C
Refractive index of medium depends upon its temperature.D
Refractive index is directly proportional to the density of the medium.Click an option to check your answer
Q. 12
Scattering is also a type of :
A
Diffused reflectionB
InterferenceC
Regular reflectionD
RefractionClick an option to check your answer
Q. 13
Light is :
A
Both (b) and (c) are correctB
Transverse waveC
Longitudinal waveD
Mechanical waveClick an option to check your answer
Q. 14
The refractive index of a medium with respect to vacuum is
A
Equal to oneB
none of the aboveC
Always less than oneD
Always greater than oneClick an option to check your answer
Q. 15
Convex lens is used in case of :
A
astigmatismB
presbyopiaC
hypermetropiaD
myopiaClick an option to check your answer
Q. 16
Speed of light is maximum in :
A
AirB
WaterC
VacuumD
GlassClick an option to check your answer
Q. 17
If the object is placed at focus of a concave mirror, the image is formed at
A
between F and O.B
centre of curvatureC
infinityD
focusClick an option to check your answer
Q. 18
Aperture is the diameter of :
A
Case of lensB
None of theseC
Only that part of lens through which refraction is taking placeD
Entire lensClick an option to check your answer
Q. 19
The perpendicular distance between the incident and emergent rays, when light is incident obliquely on a refracting slab with parallel faces is called :
A
red shiftB
blue shiftC
lateral shiftD
normal shiftClick an option to check your answer
Q. 20
The power of a lens is + 1.6 D. The nature of lens is
A
Concave lensB
both concave an convexC
none of theseD
Convex lensClick an option to check your answer
Q. 21
Magnification produced by a rear view mirror fitted in vehicles
A
is less than oneB
can be more than or less than one depending upon the position of the object in front of itC
is more than oneD
is equal to oneClick an option to check your answer
Q. 22
An object of size 2.0 cm is placed perpendicular to the principal axis of a concave mirror. The distance of the object from the mirror equals the radius of curvature. The size of the image will be :
A
2.0 cmB
0.5 cmC
1.0 cmD
1.5 cmClick an option to check your answer
Q. 23
Suppose you have focussed on a screen the
image of candle flame placed at the farthest end
of the laboratory table using a convex lens. If
your teacher suggests you to focus the parallel
rays of the Sun, reaching your laboratory table,
on the same screen, what you are expected to do
is to move the :
A
lens and screen both towards the sunB
lens slightly towards the sunC
lens slightly away from the screenD
lens slightly towards the screenClick an option to check your answer
Q. 24
Nature of the image formed by a convex mirror is
A
Real , inverted , enlargedB
Virtual, erect, diminishedC
Virtual, erect, enlargedD
Real, inverted, diminishedClick an option to check your answer
Q. 25
To obtain parallel ray from a point light source we use
A
both concave lens and convex mirrorB
both concave lens and concave mirrorC
both convex lens and concave mirrorD
both convex lens and convex mirrorClick an option to check your answer
Q. 26
A Concave Mirror Produces Magnification Of +4. The Object Is Place(d)
A
Between focus and centre of curvatureB
Between focus and poleC
Beyond the centre of curvatureD
At the focusClick an option to check your answer
Q. 27
Under which of the following conditions a concave mirror can form an image larger than the actual object?
A
When object is placed between the focus and centre of curvatureB
When object is kept at a distance greater than its radius of curvatureC
Wavelength does not changeD
The focal power of the objective and the eyepiece should be largerClick an option to check your answer
Q. 28
Electromagnetic wave theory was proposed by :
A
NewtonB
MaxwellC
HertzD
HuygensClick an option to check your answer
Q. 29
Formula to find the refractive index of a medium is
A
n=speed of light in the air/speed of light in the mediumB
n=1 /speed of light in the mediumC
n=1 /speed of light in airD
n=speed of light in the medium /speed of light in airClick an option to check your answer
Q. 30
If an object of size 5 cm is placed 20 cm from a lens and its image of same size is formed 20 cm from lens on other side, lens is :
A
glass slabB
prismC
convexD
concaveClick an option to check your answer
Q. 31
The focal length of a concave mirror is 10cm. The position of the object that is useful for getting an enlarged image which can be caught on a screen is
A
Placed at a distance of 5 cmfrom the pole of the mirrorB
Placed at a distance of 5 cm. from the pole of the mirrorC
Placed at a distance of 15 cm from the pole of the mirrorD
Placed at a distance of 35 cm from the pole of the mirrorClick an option to check your answer
Q. 32
In case of refraction, if the angle of incidence and the angle of refraction are 45 degrees and 30 degrees respectively, then the angle of deviation is
A
50B
7.5oC
15oD
0Click an option to check your answer
Q. 33
A piece of red cloth when suitably illuminated
may look black, but a piece of black cloth will
never appear red. This phenomenon occurs
because
A
Red cloth reflects all coloursB
Black cloth reflects only black lightC
Black absorbs all the coloursD
Black cloth reflects all coloursClick an option to check your answer
Q. 34
Between red and violet, which color has more frequency?
A
Red and violet has the same frequencyB
Red has more frequency than violetC
Can not sayD
Violet has more frequency than redClick an option to check your answer
Q. 35
The image is always erect in :
A
Convex mirrorB
Plane mirrorC
Concave mirrorD
Both (a) and (c) are correctClick an option to check your answer
Q. 36
An object is placed 20 cm from a convex mirror. Its image is formed 12 cm from the mirror. Find the focal length of the mirror :
A
30 cmB
15 cmC
60 cmD
25 cmClick an option to check your answer
Q. 37
A concave mirror is a part of a sphere of radius 30cm.It’s focal length is
A
10cmB
at infinityC
60cmD
15cmClick an option to check your answer
Q. 38
A lens of power 6 D is put in contact with a lens of power –4 D. The combination will behave like a :
A
convergent lens of focal length 50 cmB
divergent lens of focal length 20 cmC
convergent lens of focal length 100 cmD
divergent lens of focal length 25 cmClick an option to check your answer
Q. 39
Direction of path of light changes at the interface of the two medi(a) This phenomenon is known as :
A
total internal reflectionB
none of theseC
reflectionD
refractionClick an option to check your answer
Q. 40
The height through which an object appears to be raised in a denser medium is called :
A
normal shiftB
red shiftC
blue shiftD
lateral shiftClick an option to check your answer
Q. 41
A dentist uses a small mirror that gives a magnification of 4 when it is held 0.60 cm from a tooth. The radius of curvature of the mirror is :
A
0.8 cm (convex)B
1.60 cm (convex)C
0.8 cm (concave)D
1.60 cm (concave)Click an option to check your answer
Q. 42
Which of the following is not a natural source of light :
A
Oil-lampsB
StarsC
SunD
MoonClick an option to check your answer
Q. 43
An object AB is placed in front of a convex Lens at its principal focus The image will be formed at
A
beyond CB
infinityC
focusD
Between F & CClick an option to check your answer
Q. 44
A real image is formed when two or more :
A
Refracted rays meetB
Reflected rays meetC
Both A and B are correctD
Reflected rays appear to meetClick an option to check your answer
Q. 45
The object distance in both concave as well as convex mirror is
A
the pole of the mirrorB
the focus of the mirrorC
the image to the object.D
object to imageClick an option to check your answer
Q. 46
In torches, search lights and headlights of vehicles the bulb is placed
A
very near to the focus of the reflectorB
between the focus and centre of curvature of the reflectorC
at the centre of curvature of the reflectorD
between the pole and the focus of the reflectorClick an option to check your answer
Q. 47
The ratio of the sine of angle of incidence to the sine of angle of refraction is called
A
relative densityB
Remains constantC
Remain unchangedD
refractive indexClick an option to check your answer
Q. 48
Short sightedness is also called as :
A
astigmatismB
myopiaC
hypermetropiaD
presbyopiaClick an option to check your answer
Q. 49
A lens converges light rays. The lens is :
A
convexB
concaveC
planeD
prismClick an option to check your answer
Q. 50
Rays from sun converge at a point 15 cm in front
of a concave mirror. Where should an object be
placed so that size of its image is equal to the
size of the object?
A
30 cm in front of the mirrorB
15 cm in front of the mirrorC
More than 30 cm in front of the mirrorD
Between 15 cm and 30 cm in front of the mirrorClick an option to check your answer
Q. 51
Which of the following factors is responsible for the refraction :
A
Mass densityB
Angle of incidenceC
Optical densityD
Frequency of lightClick an option to check your answer
Q. 52
In eye, the focusing is done by :
A
change in refractive index of the eye fluidB
to and fro movement of the eye lensC
to and fro movement of retinaD
change in the convexity of the lensClick an option to check your answer
Q. 53
Focal length of a plane mirror is
A
Only one moreB
double of its apertureC
zeroD
infinityClick an option to check your answer
Q. 54
Even in absolutely clear water, a diver cannot see very clearly :
A
Because velocity of light is reduced in waterB
Because the focal length of the eye lens in water gets changed and the image is no longer focused sharply on the retinaC
Because rays of light get diffusedD
Because a ray of light passing through the water makes it turbidClick an option to check your answer
Q. 55
In convex lens, if the object is at infinity then position of image is at :
A
Between F and 2FB
InfinityC
None of theseD
At the FocusClick an option to check your answer
Q. 56
If an incident ray passes through the focus, the reflected ray will
A
Blue on a red backgroundB
be parallel to the principal axisC
retrace its pathD
Can see larger objectsClick an option to check your answer
Q. 57
An object at a distance of + 15 cm is slowly moved towards the pole of a convex mirror. The image will get
A
enlarge and virtualB
shortened and realC
diminished and virtualD
enlarged and realClick an option to check your answer
Q. 58
Mirror that can be chosen to view a tall building in a small mirror is
A
Plano-Convex mirrorB
Plane mirrorC
Convex mirrorD
Concave mirrorClick an option to check your answer
Q. 59
Coin placed in a bowl when seen from a place just disappears. When water is poured into the bowl without disturbing the coin , the coin
A
Appears above the water surfaceB
Will not be seenC
Becomes visible againD
Appears very much deep inside the waterClick an option to check your answer
Q. 60
Consider four mediums P, Q, R and S whose
refractive indices are 2.14, 1.99, 2.98, and 2.16
respectively. Assume that if light travels from
one medium to another. The rate of change will
be utmost in which medium.
A
Q to RB
S to PC
P to QD
R to SClick an option to check your answer
Q. 61
In order to get a diminished virtual image, the object can be placed anywhere in front of a
A
convex mirrorB
concave mirrorC
Continuously increasesD
Coherent and monochromatic onlyClick an option to check your answer
Q. 62
Straight line path along which light travels in a given direction is :
A
BeamB
None of theseC
RayD
Line segmentClick an option to check your answer
Q. 63
Thick layer of water is :
A
TranslucentB
OpaqueC
None of theseD
TransparentClick an option to check your answer
Q. 64
Light waves are similar in nature to :
A
Cathode raysB
Gamma raysC
Both (a) & (b)D
x-raysClick an option to check your answer
Q. 65
The radius of curvature of a mirror is 20 cm the focal length is
A
at infinityB
at 2fC
between F and 2fD
at focusClick an option to check your answer
Q. 66
The distance between the object and image will be
A
0.125 mB
0.25 mC
1.0 mD
0.5 mClick an option to check your answer
Q. 67
The focal length of a spherical mirror whose radius of curvature is 20 cm is :
A
30 cmB
10 cmC
40 cmD
20 cmClick an option to check your answer
Q. 68
The sign of power of convex lens is :
A
infiniteB
positiveC
negativeD
zeroClick an option to check your answer
Q. 69
When the ray of light falls obliquely on the interface of two media and goes to the another medium. It is called:
A
Refraction of lightB
Dispersion of lightC
Both (a) and (b)D
Reflection of lightClick an option to check your answer
Q. 70
Three students A, B and C focussed a distant
building on a screen with the help of a concave
mirror. To determine focal length of the concave
mirror they measured the distances as given
below :
Student A: From mirror to the screen
Student B: From building to the screen
Student C: From building to the mirror
Who measured the focal length correctly?
Student A: From mirror to the screen
Student B: From building to the screen
Student C: From building to the mirror
Who measured the focal length correctly?
A
B and CB
A and BC
Only AD
Only BClick an option to check your answer
Q. 71
If the magnification of a lens has negative value, the image is :
A
A or B anyB
virtual and erectC
neither A nor BD
real and invertedClick an option to check your answer
Q. 72
Refractive index of a medium does not depends on :
A
Wavelength of the light usedB
TemperatureC
Angle of incidenceD
Nature of the mediumClick an option to check your answer
Q. 73
When viewed vertically a fish appears to be 4 meter below the surface of the lake. If the index of refraction of water is 1.33, then the true depth of the fish is
A
1.11 metresB
10.2 metresC
5.32 metresD
3.32 metresClick an option to check your answer
Q. 74
A lens is thin in the middle and thick at the edges. The lens is :
A
convexB
concaveC
prismD
planeClick an option to check your answer
Q. 75
If optical density of a medium is high then the speed of light in that medium is :
A
lowB
unchangedC
none of theseD
highClick an option to check your answer
Q. 76
When light travels from one medium to the other of which the refractive index is different, then the quantities which will change :
A
Frequency and velocityB
Wavelength and velocityC
Frequency and wavelengthD
Frequency, wavelength and velocityClick an option to check your answer
Q. 77
Cylindrical lens is used in case of :
A
hypermetropiaB
myopiaC
astigmatismD
presbyopiaClick an option to check your answer
Q. 78
A ray of light strikes the surface of mirror at an angle of 300 with the mirror. The angle of reflection is:
A
600B
450C
none.D
300Click an option to check your answer
Q. 79
In optics an object which has higher refractive index is called
A
refractive indexB
optical densityC
optically denserD
optically rarerClick an option to check your answer
Q. 80
What is not a characteristic of a rear view mirror
in a car?
A
Concave in natureB
Convex in natureC
They have wider field of coverageD
They give a virtual imageClick an option to check your answer
Q. 81
A concave mirror gives, real, inverted and same size image if the object is placed
A
beyond CB
at FC
at CD
at infinityClick an option to check your answer
Q. 82
R.I. of air is :
A
1.5B
2C
1D
1.13Click an option to check your answer
Q. 83
An object 20cm high is placed at a distance of 100 cm from a plane mirror .The size of the image will be.
A
100cmB
10cmC
20 cmD
40cmClick an option to check your answer
Q. 84
When an object moves closer to a concave lens, the Image formed by it shifts
A
Towards the lensB
First towards and then away from the lensC
Away from the lensD
First away and then towards the lensClick an option to check your answer
Q. 85
A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move
the lens:
A
either towards or away from the screen depending upon the position of the object.B
to a position very far away from the screen.C
towards the screenD
away from the screenClick an option to check your answer
Q. 86
Which of the following terms is not related to spherical mirrors :
A
Principal axisB
Optical centreC
ApertureD
None of theseClick an option to check your answer
Q. 87
Two plane inclined mirrors form 5 images by multiple reflection. The angle of inclination is
A
60°B
45°C
50°D
17°Click an option to check your answer
Q. 88
Transparent medium is one :
A
Which allows most of the light to pass throughB
None of theseC
Which absorbs most of the lightD
Which partially allows light to pass throughClick an option to check your answer
Q. 89
A student determines the focal length of a device
'X' by focusing the image of a distant object on a
screen placed 20 cm from the device on the same
side as the object.
The device 'X' is:
The device 'X' is:
A
Concave mirror of focal length 20 cmB
Concave mirror of focal length 10 cmC
Convex lens of focal length 20 cmD
Concave lens of focal length 10 cmClick an option to check your answer
Q. 90
Choose wrong statement :
A
light causes in us sensation of sightB
We can see lightC
Light may be obtained from heat energyD
Light is invisible energyClick an option to check your answer
Q. 91
Focal length of a convex lens is 15 cm. For which distance an object is placed so that the lens acts as a magnifying glass?
A
Less than 15 cmB
Greater than 30 cmC
Exactly at 30 cmD
Between 15 cm and 30 cmClick an option to check your answer
Q. 92
Which of the following mirror is used by a
dentist to examine a small cavity?
A
Combination of convex and concave mirrorB
Convex mirrorC
Plane mirrorD
Concave mirrorClick an option to check your answer
Q. 93
When a ray of light passes from a denser medium to a rarer medium which angle is greater
A
noneB
angle of incidenceC
bothD
angle of refractionClick an option to check your answer
Q. 94
In an experiment to trace the path of a ray of
light through a triangular glass prism, a student
would observe that the emergent ray:
A
is along the same direction of incident ray.B
is parallel to the incident rayC
gets deviated and bends towards the thicker part (base) of the prism.D
gets deviated and bends towards the thinner part of the prism.Click an option to check your answer
Q. 95
Mirror used for focusing light is
A
planeB
ConcaveC
ConvexD
noneClick an option to check your answer
Q. 96
A concave mirror gives virtual, erect and enlarged image if the object is placed:
A
between F and CB
between P and FC
at F.D
at infinityClick an option to check your answer
Q. 97
A light is said to be convergent when :
A
It travels in an irregular patternB
all the rays converge together to a single pointC
All the rays spread around from a point source of lightD
All the rays travel parallel to each otherClick an option to check your answer
Q. 98
A student has focussed on the screen of distant
building using a convex lens. If he has selected
a blue coloured building as object, select from
the following options the one which gives the
correct characteristics of the image formed on the
screen.
A
Real, inverted, diminished and in violet shadeB
Virtual, erect, diminished and green shadeC
Virtual, inverted, diminished and in blue shadeD
Real, inverted, diminished and in blue shadeClick an option to check your answer
Q. 99
Focal length of plane mirror is:
A
at infinityB
negativeC
zeroD
None of theseClick an option to check your answer
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