MCQ Refraction of Light Plane/ Prism ICSE

Physics Class-10
By Sachin Kesharwani On Oct 12,2021

MCQ Refraction of Light Plane Prism ICSE

Physics
Objective Type Questions is based on latest reduced Class-10. These MCQ
22 session on bifurcated syllabus according 2021-
pattern. Main motto of MCQ Type Question is
the next upcoming exam of council. Visit official cracking
website CISCE for detail
information about ICSE Board Class-10
Physics.
ICSE Physics Class-10 MCQ Refraction of Light Through Plane/ Prism
MCQ
w.w ww www Type Questions wwww.wwwww.awwwmaw.wwwwu

Board ICSE

Class 10th (X)

Subject Physics
Chapter Refraction of light plane/ Prism

Syllabuss on bifurcated syllabus (after reduction)

Session 2021-22

Topic MCQ/Objective Type Question

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MCQ Type Questions for ICSE Physics MCQ Refraction of Light through Plane/|
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Prism Class-10
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Question 1: Whena ray of light from air enters a denser medium, it:

(a) Bends away from the normal

(Ry Bends towards the normal

(c) Goes undeviated

(d) Is reflected back

Answer (b) Bends towards the normal

As the speed of light decreases in the denser medium, it bends towards the
normal.
 Question 2 :A light ray does not bend
at the
boundary in passing from one
medium to the other medium if the
angle of incidence is:

(b) 45
(c) 60
(d) 90

Answer (a) 0°

(i.e. at
Reason: A ray of light which is incident normally
on the surface angle of incidence 0)
separating the two media, passes undeviated.
Question 3 The highest refractive index is of:
(a) Glass

(b) Water

cDiamond
(d) Ruby
Answer (c) Diamond

Reason: As the speed of in

light diamond is the least, diamond has the
refractive index. highest

m
Question 4 The speed of light in air is 3 x 10 si, Calculate the
in
glass. The refractive index of glass is 1.5. speed of light
(a) v= 2x 102 m/s

(b) V 24 x 1024 m/s

(c 2x 108 m/s
(d) V = 4 x 1016 m/s

Answer (c) v= 2x 108 m/s

physics class 10 chapter Refraction of light img 10
 Question 5 In refraction of light through a
prism, the light ray:
(a) Suffers refraction only at one face of the
prism
b) Emerges out from the prism in a direction parallel to the incident ray
(cBends at both the surfaces of prism towards its base
(d) Bends at both the surfaces of prism opposite to its base.
Answer (c) Bends at both the surfaces of
prism towards its base
Question 6 A ray of light suffers refraction through an
deviation equilateral prism. The
produced by the prism does not depend on the:
(a) Angle of incidence

(b) Colour of light

(c) Materiál of prism

(d)Size of prism

Answer (d) Size of prism

Question 7 A ray of light incident at an angle 48° on a prism of refracting angle

60° suffers minimum deviation. Calculate the angle of minimum deviation.

(a) min120

(b) Omin 240

(c) &hin480
dYOmin 360

Answer (d) Omin 36

Angle of incidence, i = 480

Refracting angle, A = 60

Angle of minimum deviation, Onin =?

We know that
Omin 2i- A
-

Omin 2(48) 60

Omin 96-60
Omin 360

Question 7 What should be the angle of incidence for a ray of light which
suffers a minimum deviation of 36° through an
equilateral prism?
(a)i=12 0
(b) i = 240

480
(d) i=60

Answer (c) i= 48°

Angle of prism, A 60

Angle of minimum deviation, Omin 360

Angle ofincidence, i =?

We know that
Omin 2i-A

36 2i-60°
i=480
Question 8 A small air bubble in a glass block when seen from above appears
to be raised because of:

(a Refraction of light

(b) Reflection of light

(c) Reflection and refraction of light

(d) None of the above

Answer (a) Refraction of light

 Hint: When a ray of light travels from denser to rarer
from the normal. medium, it moves away

Question 9 An object in a denser medium when

viewed from a rarer medium
appears to be raised. The shift is maximum for:

(a) Red light

(bViolet light
(c) Yellow light

(d) Green light

Answer (b) Violet light

Hint: The shift is maximum for violet

light because the refractive index of glass is
the most for the violet light and
apparent (real depth)/refractive index)
Question 10 A water pond appears to be 2.7 m deep. If the refractive index of
wateyis 4/3. find the actual depth of the pond.

(o 3.6 m
(b) 3.6 m

(c) 3.6 m

(d) 3.6 m

Answer (a) 3.6 m

Apparent depth 2.7 m

Refractive index of water w = 4/3

=
Real depth x
Apparent depth Hw

Real depth 2.7 x 4/3

Real depth = 3.6 m

Question 11 A coin is placed at the bottom of a beaker

containing water
=
(refractive index 4/3) to a depth of 12 cm. By what height the coin
appears to
be raised when seen from vertically above?
 (a) 2 cm

(b) 9 cm

3 cm
(d) 1.5 cm

Answer (c) 3 cm

Refractive index =
of the water, hw 4/3
Real depth at which coin is =
12 cm
placed
Shift in the image = ?
Shift Real depth x (1-1/p)
Shift 1 2 x
(1 -3 /4)
Shift 12/4
Shift 3 cm or R = 3 cm

Question 12 A postage stamp kept below a rectangular glass block or refractive

index 1.5 when viewed from vertically above it,
appears to be raised by 7.0 mm.
Calculate the thickness of the glass block.

(a) 3.1 cm

(b 2.1 cm

(c) 2.5 cm

(d) 4.2 cm

Answer (b) 2.1 cm

Refractive index of the glass block, Hg 1.5

Shift in the image =7 mm or 0.7 cm

Thickness of glass block or real depth = ?

Shift Real depth x (1-1/)

0.7 Rx(1 -1/1.5)

 R (0.7x 1.5)/0.5
R 2.1 cm

Question 13 The critical angle for glass-air interface is:

(a) 24
(b) 48
kc42
(d) 45
Answer (c) 42°

Question 14 A total reflecting right angled isosceles prism can be used to

deviate a ray of light through
(a) 30°

(b) 60
(c) 75

Answer (d) 90°

Question 15 A total reflecting equilateral prism can be used to deviate a ray of

light through:
(a) 30°

4b}60°

(c) 75
(d) 90

Answer (b) 60°

Question 16 The refractive index of water with respect to air is 4/3. What is the
refractive index of air with respect to water?

3
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 MCQ Refraction of Light Plane/ Prism ICSE Physics Class-10

By Sachin Kesharwani On Oct12,2021

(a) 0.5
b0.75
(c) 1.5

(d) 0.70

Answer(b) 0.75
Given, refractive index of water w.r.t. air,
aamabe
refractive index of air w.r.t. water is:
waleair = 1 0.75

awaber

Question 17 A ray of light of wavelength 5400 A suffers refraction from air

to =
glass. Taking =3/2, find the wavelength of light in glass.
(a) 1200 A
(b) 4200 A

(c) 4800 A
(d) 3600 A

An[wer (d) 3600 A

Given, refracbve index of glass w.r.t. air,

AS0, Wavelength of light in ar

Wavalength of light in glass
Waveleng th of light in air
2 Wavelength of light in glass

5400
Wavelength of light in giass
wavelength of light in glass x 5400 A = 3600 A

Question 18 When a beam of light strikes a glass slab a

part of it is:
 (oreflected
(b) absorbed
c) transmitted
(d) all of these

Answer: (a) reflected

Question 19 The phenomenon due to whicha ray of light deviates from its
path while travelling from one optical medium to another optical medium is
called

(a) dispersion
(brefraction
(c) reflection
(d) diffraction

Answer: (b) refraction

Question 20 Whena ray of light travelling in an optically denser medium,

emerges into an optically less denser medium it:

(a) deviates towards the normal

(by deviates away from normal
(c) does not deviate
(d) gets reflected

Answer:(b) deviates away from normal

Question 21 A ray of light strikes a glass slab at 90°. The angle of

incidence is:

(a) 90
(bYzero
(c) less than 90°, but not zero
(d) none of these

Answer: (b) zero

Question 22 Two medium 'a' and 'b' have same refractive index. A ray of
light traveling from medium 'a ' to medium 'b. will suffer?
 (a) reffaction at the interfaces
(bpartly suffer reflection at the interfaces
(c) partly gets absorbed in medium 'b
(d) both (b) and (c)

Answer: (b) partly suffer reflection at the interfaces

Question 23 A ray of light on entering from medium 'a' to medium 'b does
not suffer refraction. The angle of incidence in medium 'a 'is :

(a) 90°
tb zero
(c) 45
(d) 60
Answer: (6) zero

Question 24 During sun rise or sun set, the sun appears bigger because the
rays of light coming from it pass through

(alarger length of atmosphere

(b) smaller length of atmosphere
(c) the earth gets closer to sun
(d) none of these

Answer: (o) larger length of atmosphere

Question 25 The highest refractive index is of

(a) glass
(b) woter
(c) djamond
(d) cold air

Answer: (d) cold air

Question 26 During spearfishing a fisherman aims at the:

(a) tail of fish

(b) head of fish
(c) slightly ahead of the head of fish
 (d) none of these

Answer:(a) tail of fish

Question 27 When a ray of light

enters into another
optical medium, its
wavelength and
velocity change. The material in which
wavelength and
air is:
velocity decrease maximum, when the ray is travelling through
(a) alcohol
(bYdiamond
(c) glass
(d) water

Answer: (6) diamond

Question 28 A thick glass slab with a silvered side forms multiple images
on account of:

(a) reflection of light

(b) dispersion of light
(c) refráction of light
d Both reflection and refraction of light
Answer: (d) both reflection and refraction of
light

Question 29The velocity of light in air is 3x 10 ms and in glass is 2x

10 ms Find the refractive index of
glass.
 (a) 1.5
(b) 3
c) 2.5
(d) none of the above

Answer: (a) 1.5

velocity of light in air
R.I of glass
velocity of light in glass
3x10
P 2x10

Question 30 A coin is
placed at a depth of 15 cm in a beaker containing
water. The refractive index of water is 4/3,
calculate height through which
the image of the coin is raised.

(a) 1.5 cm
(b) 6.75 cm
(c) 3.75 cm
(d) none of the above

Answer: (c) 3.75 cm

Real depth
Refractive index of water Apparent
depth
4 1Scm

Apparent depth r= =1.25 cm

=
Height through which image is raised 15- I1.25-3.75 cm

m. If the
Question 31 The floor of a water tank appears at a depth of 2.5
refractive index of water is 1.33, find the actual depth of water.

(a) 3.325 m
(b) 6.650m
(c) 9.975 m
(d) none of the above

Answer: (a) 3.325 m

Observed depth= 2.5 m
R.I. of water 1.33
Actual depth = ?

Real depth
R.I. =
Apparent depth

1.33
Actual depth x = 1.33 x 2.5 3 . 3 2 5 = 3.325 m

Question 32 A stone placed at the bottom of a water tank appears raised

by 80 cm. If the refractive index of water is 4/3, find the actual depth of
water in the tank:

(a) 640 cm
(b) 320 cm
(c) 160 cm
(d) none of the above

Answer: (b) 320 cm

Let the stone is at actual depth of =x cm

observed depth = (x - 80) cm

RI.
Actual depth
observed depth

3x-80
4(x 80)= 3x
4x-3x320
Actual depth= x = 320 cm

F
Question 33total internal reflection to take place a ray of light must
(atravel from denser to rarer medium
(b) travel from rarer to denser medium
(c) medium does not play any role
(d) none of these

Answer: (a) travel from denser to rarer medium

Question 34 The critical angle for a material X is 45. The total internal
reflection will take place,ifthe angle of incidence in the denser medium is

(a) less than 45°

(b)90
(o) morethan 45°, but not 90°
(d) less than 45, but not zero degree

Answer: (c) more than 45 , but not 90°

Question 35 Small air bubbles rising up a fish tank appear silvery when
viewed from some particular angle because ofthe phenomenon of:

(a) reflection
(b) refraction
ctotal internal reflection
(d) dispersion
Answer: (c) total internal reflection

Question 36 An isosceles totally reflecting prism can reflect rays through an

angle of:

(a) 60
(b) 90
(c) 180
(dyboth (b) and (c)

Answer: (d) both (b) and (c)

Question 37 A ray of light is incident on the face of an equilateral prism at

angle of 90°. The ray gets totally reflected on the second refracting face. The
total deviation produced in the path of ray is:
(a) 60
(b) 90
Ic 120°
(d) 180°

Answer: (c) 120°

Question 38 A crack in the window pane appears
some particular angle. This
silvery when viewed from
phenomenon due to:
(a) refelction light
(b) refraction of light
(ctotal internal reflection of light
(d) dispersion of light

Answer: (c) total internal reflection of

light
Question 39 When an equilateral prism is in minimum deviation position the
angle of incidence is

(a) greater than the angle of emergence

(b) smaller than the angle of emergence
(c)équal to the angle of emergence
(d) none of these

Answer:(c) equal to the angle of emergence

Question 40 When a ray of light passes through an equilateral glass pris

(a) it suffers refraction on the first refracting surfaces
b} it suffers refraction on both the refracting surfaces
c) it bends towards the base on both refracting surfaces
(dboth (b) and (c)

Answer: (d) both (b) and (c)

Question 41 A ray of light after refraction through a lens emerges

parallel to the principal axis of the lens. The incident ray either
passes through:
(a) its optical centre

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 MCQ Refraction of Light Plane/ Prism ICSE Physics Class-10
By Sachin Kesharwani On Oct 12, 2021

(its first focus

(c) its second focus

(d) its centre of curvature of the first surface

Answer 1 (b) its first focus

Question 42 A ray of light incident on a lens parallel to its principal
axis, after refraction passes through or appears to come from:
(aHts first focus

6) Its optical entre

(c) Its second focus

(d) The centre of curvature of its second surface

Answer 2 (C) lts-secenel focus

Study the following figure and tick the answer

Study the diagram given below.

Question 43 Name the lens LL.

a) concave

(b)Convex
(c) Plane
(d) None of these

Answer (b) Convex

Question 44- What are the points O and O' called?

(q)first and second focal points

(b) second and first focal points

(c) centre of curvature and radius of curvature

(d) optical centre

Answer (a) first and second focal points

Question-45 State the three characteristics of the image.

(a) diminished, virtual and inverted

(b) magninfed, real and upright

(c) diminished virtual and upright

magnified, virtual and upright

Answer (d) magnified, virtual and uprights
Question 46 Name a device in which this action of lens is used.

acamera
(b) eyeglass
Cmagnifying glass
(d) All the above

.Answer (d) AFthercbeve

Question 47 For an object placed at distance 20 cm in front of a

convex lens, the image is at distance 20 cm behind the lens. The
focal length of convex lens is:
 (a) 20cm
1 b 10 cm

(c) 15 cm

(d) 40 cm

Answer (b) 10 cm
Hint As the object distance = image distance, the object must be kept at 2f.

Therefore, 2f 20 cm or f 10 cm.
Question 48 For the object placed between optical centre and focus
of a convex lens, the image is
(a) Real and enlarged

(b) Regand diminished

cirtuol and enlarged

(d) Virtual and diminished.

Answer (c) Virtual and enlarged

Explanation: When the object is kept between optical centre and focus of a
convex lens, the image is formed on the same side, behind the object. The
image thus formed is virtual, enlarged and erect

Question 49 A concave lens forms the image of an object whichis:

(a) Vitual, inverted and diminished

(byVirtual, upright and diminished

(c) Virtual, inverted and enlarged

(d) Virtual, upright and enlarged

Answer (b) Virtual, upright and diminished

Hint: Concave lens forms virtual, upright and diminished image for all
positions of the object.