wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Refraction of light 9

Total questions: 83

Worksheet time: 47mins

Name
Class
Date
1.

What letter is used to represent refractive index?

a)

c

b)

n

c)

v

d)

θ

2.

What letter is used to represent the speed of light?

a)

c

b)

n

c)

v

d)

θ

3.

What is a line drawn at 90° to a surface called?

a)

incident ray

b)

normal line

c)

refracted ray

d)

tangent

4.

What causes refraction?

a)

A change in frequency of a wave.

b)

A change in amplitude of a wave

c)

A change in speed of a wave.

d)

A change in phase of a wave.

5.

What direction does the ray bend when entering a more optically dense material, where the wave travels more slowly?

a)

Towards the normal.

b)

Away from the normal.

c)

No change.

d)

Answer is not listed above.

6.

What is the refractive index of air?

a)

1.5

b)

1.2

c)

0.5

d)

1.0

7.

Which is the correct equation for refractive index?

a)

n = v /c

b)

n = v × c

c)

n = c / v

d)

n = c v

8.

Which of the following is true about a wave that has been refracted?

a)

The speed and frequency changes, but the wavelength stays the same.

b)

The speed and wavelength changes, but the frequency stays the same.

c)

The wavelength and frequency changes, but the speed stays the same.

d)

The speed and frequency changes, but the amplitude stays the same.

9.
Swimming pools and the ocean look shallower than they really are due to:
a)
reflection 
b)
dispersion
c)
refraction
d)
total internal reflection
10.

What is the speed of light in water of refractive index 1.33?

a)

3.0×108m/s

b)

2.0×108m/s

c)

2.3×108m/s

d)

3.9×108m/s

11.

Which of the following is true?

a)

When light travels from a vacuum into glass it speeds up.

b)

When light travels from a vacuum into glass it bends away from the normal.

c)

When light travels from a vacuum into glass the frequency decreases.

d)

When light travels from a vacuum into glass the wavelength decreases.

12.

Which of the following is a correct representation of snell's law?

a)

n1sinθ2=n2sinθ1

b)

n1sinθ1=n2sinθ2

c)

n2sinθ1=n1sinθ2

d)

n1/sinθ1=n2/sinθ2

13.
In what medium does light travel the fastest?
a)
vacuum
b)
air
c)
water
d)
glass
14.
When light passes at an angle to the normal from one material into another material in which its speed is lower
a)
it is bent towards the normal.
b)
it always lies along the normal.
c)
it is unaffected.
d)
it is bent away from the normal.
15.
Light has the lowest velocity in which medium?
flint glass n=1.70
barium glass n=1.60
crown glass n=1.523
water n=1.33
diamond n=2.45
a)
diamond
b)
water
c)
flint glass
d)
barium glass
16.

Based on the image, which medium has a larger index of refraction?

a)

Medium 1 has a larger index of refraction.

b)

Medium 2 has a larger index of refraction.

c)

Both mediums have the same index of refraction.

d)

Cannot be determined.

17.

Based on the image, as light passes from medium 1 to medium 2

a)

light speeds up and bends towards the normal

b)

light speeds up and bends away from the normal

c)

light slows down and bends towards the normal

d)

light slows down and bends away from the normal

18.

What is it called when light bends as it moves from one substance to another?

a)

Absorption

b)

Reflection

c)

Refraction

d)

Incidence

19.

Why does the straw appear to be bent?

a)

light is reflected

b)

light is absorbed

c)

light is turned

d)

light is refracted

20.
How does light behave as it enters these mediums?
a)
continue its path as straight line.
b)
bends toward the normal
c)
bends away from the normal
d)
reflects
21.
When a red light ray travels from air into a glass block, its
a)
velocity increases and its wavelength decreases 
b)
velocity decreases and its frequency stays the same
c)
velocity decreases and its frequency increases
d)
velocity remains the same and its wavelength decreases
22.

Which of the following statements is NOT TRUE?

a)

B is the incident ray

b)

D is not lie in the same plane as A, B and C

c)

B and D are parallel light rays

d)

incident angle is greater than the refracted angle

23.

Given the refractive index of:

flint glass n=1.70

crown glass n=1.523

water n=1.33

diamond n=2.45

Light has the highest velocity in which medium?

a)

flint glass

b)

crown glass

c)

water

d)

diamond

24.

According to Willebord Snell, light passing from air to glass will cause the light to

a)

maintain its speed in glass

b)

increase its speed in glass

c)

bend towards the normal

d)

accelerate in the glass

25.

Light travels through a liquid at 2.25 x 10 8 ms-1. What is the refractive index of the liquid? (speed of light in vacuum = 3.00 x 10 8 ms-1)

a)

1.33

b)

1.18

c)

1.00

d)

0.75

26.

Which one shows the angle of refraction of the light?

a)

A

b)

B

c)

C

d)

D

27.

A ray of light in air is incident at an angle on one side of a rectangular glass block, as shown. Which ray diagram correctly describes the complete path of the ray of light?


(Determine if light bends towards or away from normal at each boundary)

a)
b)
c)
d)
28.

When does the light is refracted?

a)

When light travels in a straight line

b)

When light is bounced

c)

When light travels in two different mediums

d)

When light cannot pass through an opaque object

29.

Diagram shows the condition of a spoon in a glass of water.

What can be observed about the spoon?

a)

The spoon looks bent.

b)

The water is clearer.

c)

The water level rises.

d)

Light is refracted.

30.

What is the conclusion from your observation in this picture?

a)

Light travels in a straight line

b)

Light can be refracted

c)

Light can be reflected

d)

Light can pass through a transparent material

31.

Light passes into a glass block. Which is the angle of refraction?

a)

A

b)

B

c)

C

d)

D

32.

What direction does the ray bend when entering a more optically dense material, where the wave travels more slowly?

a)

Towards the normal.

b)

Away from the normal.

c)

No change.

d)

Answer is not listed above.

33.
Glass has a _____________ index of refraction than air.
a)
Equal
b)
Greater
c)
Less
d)
Impossible to say
34.
This shows the phenomenon known as....
a)
reflection
b)
refraction
c)
mirrors
d)
focal point
35.
The velocity of light in vacuum is _______ m/s.
a)
3x108
b)
3x1012
c)
3x106
d)
3x1010
36.
Why does the lower part of the child appear so much different in size from the upper part?
a)
The light rays that travel through water and then into air are refracted.
b)
The light rays that travel through water and then into air are enlarged.
c)
The light rays that travel through air and then into water are reflected.
d)
The light rays that travel through air and then into water are reduced.
37.

Refraction is when light__________.

a)

Is bounced by an object or material.

b)

Changes speed as it travels in different materials which causes bending.

c)

When light speeds up to over 300,000 km/s

38.

Light emerging from water to air will bend ______ due to the change of speed as it crosses the boundary.

a)

toward the normal

b)

away from the normal

c)

along the normal

39.

Light travels through air, water, glass and many other materials. What path does it travel to get from one place to another?

a)

sideways

b)

back and forth

c)

straight

d)

up and down

40.
What form does light travel in?
a)
Curved line
b)
Zig-Zag
c)
Straight Line
41.
Light bending as it passes through a rain drop is an example of...
a)
Refraction
b)
Reflection
42.
What causes light to appear refracted?
a)
temperature
b)
speed
c)
weather
d)
climate
43.
Absolute refractive index of any medium is always _______.
a)
less than 1
b)
greater than 1
c)
1
d)
0
44.
The velocity of light in vacuum is _______ ms(-1)
a)
3x108
b)
3x1012
c)
3x106
d)
3x1010
45.
Glass has a _____________ index of refraction than air.
a)
Equal
b)
Greater
c)
Less
d)
Impossible to say
46.
A student placed a pencil in a cup of water.  The pencil appears broken because light-
a)
always travels in a straight line
b)
bends when it passes through water
c)
makes the water in the glass evaporate
d)
reflects the pencil on the water's surface
47.

Which of the following is correct about refraction of light?

a)

Velocity of light is equal to zero as it propagates through the medium of different optical densities

b)

Velocity of light is changes as it propagates through the medium of different optical densities

c)

Velocity of light is constant as it propagates through the medium of different optical densities

d)

Velocity of light does not exist it propagates through the medium of different optical densities

48.

Which of the following statement is correct?

a)

Light rays that propagate from a denser medium to less dense medium will refracted towards the normal line

b)

Light rays that propagate from a denser medium to less dense medium will refracted parallel to the normal line

c)

Light rays that propagate from a denser medium to less dense medium will refracted away the normal line

d)

Light rays that propagate from a denser medium to less dense medium will show no reaction

49.

How many law of refraction of light that we have learnt?

a)

1

b)

2

c)

3

d)

4

50.

What is the velocity of light in sodium chloride, NaCl of reflective index, n = 1.54?

a)

5.13 ×10−9ms−15.13\ \times10^{-9}ms^{-1}

b)

1.95×108 ms−21.95\times10^{8\ }ms^{-2}

c)

5.13×10−9ms−25.13\times10^{-9}ms^{-2}

d)


1.95×108ms−11.95\times10^8ms^{-1}

51.

 n =cvn\ =\frac{c}{v}  
The above formula is one of the way to determine the refractive index. What is the value of c?

a)

 3×10−8ms−13\times10^{-8}ms^{-1}  

b)

 3 ×10−8ms−23\ \times10^{-8}ms^{-2}  

c)

 3×108ms−23\times10^8ms^{-2}  

d)

 3×108ms−13\times10^8ms^{-1}  

52.

All the following are true about total internal reflection except

a)

incident angle, i = critical angle, c

b)

incident angle exceeds the critical angle for two mediums

c)

light ray propagates from a denser medium to a less dense medium

d)

total internal reflection helps in the formation of rainbow

53.

Which of the following is false about optical fibre?

a)

Use in the field of medicine and telecommunication

b)

Undergoes repeated refraction

c)

Fibres are cheap and easy to handle

d)

No electomagnetic interference

54.

Total internal reflection can only occur if

a)

Angle of incident, i = Angle of critical angle, c

b)

Angle of incident, i < Angle of critical angle, c

c)

Angle of incident, i > Angle of critical angle, c

55.

Which of the following factors change when light refracts?

a)

Frequency only

b)

Wavelength only

c)

Speed and frequency

d)

Wavelength and speed

56.

A straight glass rod appears to bend when placed in a beaker of water, as shown in the diagram below. What is the best explanation for this phenomenon?

a)

The water is warmer than the air

b)

Light travels faster in water than in air

c)

Light is reflected at the air-water interface

d)

Light is refracted as it crosses the air-water

interface

57.

What happens to the speed and frequency of a light ray when it passes from air into water?

a)

The speed decreases and the frequency increases

b)

The speed decreases and the frequency remains the same

c)

The speed increases and the frequency increases

d)

The speed increases and the frequency remains the same

58.

A ray of red light from a laser passes into a semi- circular glass block.What is shown at M?

a)

Dispersion

b)

Rarefaction

c)

Reflection

d)

Refraction

59.

Which quantity is equivalent to the product of the absolute index of refraction of water and the speed of light in water?

a)

wavelength of light in a vacuum

b)

frequency of light in water

c)

sine of the angle of incidence

d)

speed of light in a vacuum

60.

The diagram below shows a ray of monochromatic light incident on a boundary between air and glass. Which of the letters represent the path after it strikes the glass?

a)

A

b)

B

c)

C

d)

D

61.

If the index of refraction of a certain material is n = 2, the speed of light in this material is ________.

a)

6.7 × 107

b)

1.5 × 108

c)

3.0× 108

d)

6.0 × 108

62.

The speed of light in a piece of plastic is 2.00 × 108 m/s. What is the absolute index of refraction of this plastic?

a)

0.67

b)

1.0

c)

1.33

d)

1.5

63.

light does not require a medium to move through

a)

true

b)

false

64.

light does not require a medium to move through

a)

true

b)

false

65.

an object that is transparent allows light to pass through it. Select the one below that is transparent.

a)

glass

b)

brick

c)

car

d)

timber

66.

translucent means...

a)

all light easily passes through

b)

no light passes through

c)

light is absorbed

d)

some scattered light passes through

67.

the law of refraction is the angle a refracted ray makes with the normal

a)

true

b)

false

68.

angle of incidence is

a)

the angle incoming ray makes with normal

b)

angle between refracted ray and normal

69.

angle of refraction is the

a)

angle between refracted ray and normal

b)

angle incoming ray makes with normal

70.

Refractive index measures how easily light travels through a substance. The higher the refractive index, the more the light bends when it enters the substance.

a)

true

b)

false

71.

When the angle of refraction is 90 °\degree  the angle of incidence is called the... 

a)

Angle of incidence

b)

Critical angle

c)

Angle of total internal reflection

d)

Angle of refraction

72.

_____ cables transmit beams of light without allowing any of the light to escape until it gets to the end of the cable.

a)

Ethernet

b)

Fiber optic

c)

Armored

d)

Coaxial

73.

Which diagram correctly describes the critical angle c for air-water surface?

a)

A

b)

B

c)

C

d)

D

74.

Light travels through a glass block as shown. Which angle is the critical angle for light in the glass?

a)

A

b)

B

c)

C

d)

D

75.

Which letter refers to the normal line?

a)

A

b)

B

c)

F

d)

E

76.

Why does light refract when it enters a medium?

a)

light changes color

b)

light changes frequency

c)

light changes speed

d)

light changes density

77.

Which diagram shows a ray hitting a semicircular glass block at the critical angle, θ?

a)
b)
c)
d)
78.

Diagram 20 shows a light ray, P is directed to the centre, O of semicircular glass block. Refractive index of the glass is 1.57.

At which direction A, B, C or D does the light propagate after point O?

a)

A

b)

B

c)

C

d)

D

79.

If Total Internal Reflection occurs the light will bounce back at the same angle it came in

a)

True

b)

False

80.

If light hits at an angle larger than the critical angle it will refract and pass through the material

a)

True

b)

False

81.

Refraction occurs when light changes mediums, but does not change speeds

a)

True

b)

False

82.

The higher the index of refraction, the faster light travels in that medium

a)

True

b)

False

83.

Light traveling from a higher index of refraction to a lower index of refraction will bend towards the normal (refract at a smaller angle)

a)

True

b)

False

Similar Resources on Wayground

2.5 MOMENTUM

80 questions

2.5 MOMENTUM

quiz

Worksheet

•

11th - 12th Grade

22/23 Midterm Review

78 questions

22/23 Midterm Review

quiz

Worksheet

•

9th Grade

CIA 2 Review

84 questions

CIA 2 Review

quiz

Worksheet

•

9th Grade

UST3122 Q1-V3

84 questions

UST3122 Q1-V3

quiz

Worksheet

•

12th Grade - University

Dynamics

80 questions

Dynamics

quiz

Worksheet

•

11th - 12th Grade

Describing Motion

87 questions

Describing Motion

quiz

Worksheet

•

5th - 12th Grade

Forms of Energy Quest Review

79 questions

Forms of Energy Quest Review

quiz

Worksheet

•

6th - 8th Grade

Heat and Air Pressure Review 2018

78 questions

Heat and Air Pressure Review 2018

quiz

Worksheet

•

6th - 8th Grade