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Refraction of light

Total questions: 64

Worksheet time: 1hrs 11mins

Name
Class
Date
1.

The diagram shows a ray of light going from medium A into medium B. Which one of the following statements cannot be correct?

a)

A is air and B is glass.

b)

A is water and B is vacuum.

c)

A is water and B is air.

d)

A is glass and B is vacuum.

2.

A ray of light is shone on a rectangular glass block as shown. Identify A, B and C.

a)

A = Refracted ray, B = Incident ray, C = Normal

b)

A = Incident ray, B = Refracted ray, C = Normal

c)

A = Normal, B = Refracted ray, C = Incident ray

d)

A = Refracted ray, B = Angle of incidence, C = Angle of refraction

3.

When a drinking straw is placed in a container of water so that it is partly submerged, it appears bent because of

a)

apparent depth

b)

Snell's Law

c)

Refraction

d)

lateral inversion

4.

The diagram shows a ray of light AB striking the interface of medium X and medium Y. BC is the refracted ray. Which one of the following statements is correct?

a)

Medium X is optically less dense than Y and ray BC travels faster than AB.

b)

Medium X is optically denser than Y and ray BC travels slower than AB.

c)

Medium X is optically denser than Y and ray BC travels faster than AB.

d)

Medium X is optically less dense than Y and ray BC travels slower than AB.

5.

When light passes from one medium into another, refraction occurs. This is because of

a)

reflection of light.

b)

a change in color of the light.

c)

a change in velocity of the light.

d)

the absorption of light.

6.

A light ray does not bend at a boundary between two media of different optical densities if its angle of incidence is

a)

180o

b)

45o

c)

0o

d)

90o

7.

The quantity which does not changes during refraction is

a)

direction

b)

speed

c)

frequency

d)

wavelength

8.

The ratio of sin (x °) of the angle of incidence to sin (x °) of the angle of refraction is

a)

Gravitational law

b)

Reflection law

c)

Snell's law

d)

refraction law

9.

The best definition of refraction is ____.

a)

passing through a boundary

b)

changing direction when crossing a boundary

c)

changing speed at a boundary

d)

bouncing off a boundary

10.

When light travels from air into water, the light bends ____________.

a)

towards the normal line

b)

away the normal line

c)

perpendicular to the normal line

d)

in an odd shape

11.

A light ray is incident on a glass block as shown. Identify the correct statement.

a)

The glass block is optically denser than the medium outside and the ray bends towards the normal.

b)

The glass block is optically less dense than the medium outside and the ray bends away from the normal.

c)

The glass block is optically denser than the medium outside and the ray bends away from the normal.

d)

The glass block is optically less dense than the medium outside and the ray bends towards the normal.

12.

When light travels from air into water, the light bends ____________.

a)

away the normal line

b)

perpendicular to the normal line

c)

in an odd shape

d)

towards the normal line

13.

The best definition of refraction is ____.

a)

passing through a boundary

b)

changing speed at a boundary

c)

bouncing off a boundary

d)

changing direction when crossing a boundary

14.

When light passes from a denser material into a less dense material...

a)

light slows down and bends toward the normal

b)

light slows down and bends away from the normal

c)

light speeds up and bends toward the normal

d)

light speeds up and bends away from the normal

15.

Identify the correct definition of the critical angle.

a)

The critical angle is the angle of incidence when the angle of refraction is exactly 90°90\degree and light is refracted along the boundary

b)

The critical angle is the angle of refraction when the angle of incidence is exactly 90°90\degree and light is refracted along the boundary

c)

The critical angle is the angle of incidence when the angle of refraction is exactly 90°90\degree and light is reflected along the boundary

d)

The critical angle is the angle of refraction when the angle of incidence is exactly 90°90\degree and light is reflected along the boundary

16.

The diagram shows a ray of light inside a perspex rod . Perspex has a critical angle of 42°42\degree .

Which one is the correct condition whether there is any light reflected from the surface, and whether there is any light refracted out of the perspex rod?

a)

reflected: yes

refracted: yes

b)

reflected: yes

refracted: no

c)

reflected: no

refracted: yes

d)

reflected: no

refracted: no

17.

The diagram shows light passing from air into glass. A number of angles have been labelled on the diagram.

Which of equations could be used to correctly calculate the refractive index, n, of the glass?

a)

sin⁡ Psin⁡ S\frac{\sin\ P}{\sin\ S}

b)

sin⁡ Qsin⁡ R\frac{\sin\ Q}{\sin\ R}

c)

sin⁡ Psin⁡ R\frac{\sin\ P}{\sin\ R}

d)

sin⁡ Qsin⁡ S\frac{\sin\ Q}{\sin\ S}

18.

Light enters a flat water surface at an angle of 27°27\degree .

The refractive index of water is 1.33.

At what angle does the light ray refract?

a)

0.34°0.34\degree

b)

20.0°20.0\degree

c)

20.3°20.3\degree

d)

37.0°37.0\degree

19.

A ray of light is shone into a semi-circular glass block so that it makes an angle of 42°42\degree with the rear, flat edge of the block as shown.

Calculate the refractive index of the glass.

a)

0.023

b)

1.49

c)

2.381

d)

1.35

20.

The diagram shows a ray of light being totally internally reflected at boundary between substances A and B.

a)

A

b)

B

c)

C

d)

D

21.

The diagram shows a ray of light incident on the edge of a piece of glass. The angle i is bigger than the critical angle.

Which arrow correctly shows the direction of the ray after it leaves the edge of the glass?

a)

A

b)

B

c)

C

d)

D

22.

Answer the question correctly.

a)

A

b)

B

c)

C

d)

D

23.

Which diagram shows how a ray of light could pass through a glass block in air?

a)

b)

c)

d)

24.

Answer the question correctly.

a)

A

b)

B

c)

C

d)

D

25.

Light travelling in air enters a plastic block at an angle of incidence of 62°62\degree .

The plastic has a refractive index of 1.48.

What is the angle of refraction?

a)

18°18\degree

b)

28°28\degree

c)

37°37\degree

d)

42°42\degree

26.

The diagram shows light travelling from glass to air.

What is the angle of refraction for this ray of light?

a)

20°20\degree

b)

40°40\degree

c)

50°50\degree

d)

70°70\degree

27.

A student draws four diagrams to represent light passing from air through a glass block and then back into the air.

The critical angle of glass is 42°42\degree .

In which diagram is the path of the light through the glass block not correct?

a)

b)

c)

d)

28.

The diagram shows the light passing from air into glass.

The glass has refractive index of 1.5.

What is the angle of refraction in the glass?

a)

19°19\degree

b)

22°22\degree

c)

35°35\degree

d)

49°49\degree

29.
Light has the highest 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
30.
Light has the highest 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
31.
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
32.
According to Willebord Snell, light passing from air to glass will cause the light to
a)
maintain its original speed 
b)
accelerate while it is in glass
c)
increase its speed
d)
reduce its speed
33.
According to the Law of reflection, a light ray striking a mirror
a)
continues moving through the mirror in the same direction
b)
moves into the mirror at a slightly different angle
c)
bounces off the mirror toward the direction it came from
d)
bounces off the mirror at the same angle it hits.
34.
Glass has a _____________ index of refraction than air.
a)
Equal
b)
Greater
c)
Less
d)
Impossible to say
35.
The fact the two angles are the same is an example of....
a)
Refraction
b)
Angle of Incidence
c)
Law of reflection
d)
Magnification
36.
This shows the phenomenon known as....
a)
reflection
b)
refraction
c)
mirrors
d)
focal point
37.
Light travels through a liquid at 2.25 EE 8 m/s. What is the index of the liquid?
a)
1.33
b)
1.0
c)
1.523
d)
2.45
38.
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
39.
The velocity of light in vacuum is _______ m/s.
a)
3x108
b)
3x1012
c)
3x106
d)
3x1010
40.
The formula to calculate the refractive index is
a)
n=cv
b)
n=v/c
c)
n=c/v
d)
v=nc
41.
Light travels at 1.76 EE 8 m/s through an optical medium.  What is the medium?
diamond n=2.45
flint glass n=1.70
barium glass n=1.60
crown glass n=1.523
a)
Crown Glass
b)
Barium Glass
c)
Flint Glass
d)
Diamond
42.
We can see objects because of_______
a)
reflection
b)
refraction
c)
transmission
d)
diffraction
43.
Absolute refractive index of any medium is always _______.
a)
less than 1
b)
greater than 1
c)
1
d)
0
44.
Swimming pools and the ocean look shallower than they really are due to:
a)
reflection 
b)
dispersion
c)
refraction
d)
total internal reflection
45.
Velocity of light ______ when it passes from optically denser to optically rarer medium
a)
decreases
b)
increases
c)
does not change
46.

The formula for magnification is

a)

height of object/height of image

b)

height of image /height of object

c)

h'/h

d)

h/h'

47.

What is the lens formula used to calculate the position of an image?

a)

(1/f = 1/v + 1/u)

b)

(1/f = 1/v - 1/u)

c)

(1/f = 2/v + 2/u)

d)

(1/f = 1/v^2 + 1/u^2)

48.

A 15.0 m object is placed 10.0 m from a convex lens, which has a focal length of 15.0 m.

Use the thin lens equation to find the distance of the image.

a)

-10

b)

10

c)

-30

d)

30

49.

Calculate the power of a concave lens of focal length 60 cm

a)

−1.67 D-1.67\ D

b)

+1.67 D+1.67\ D

c)

−16.7 D-16.7\ D

d)

+ 16.7 D+\ 16.7\ D

50.

An object is placed 60.0 cm from a convex lens, which has a focal length of 15.0 cm. Use the lens formula to find the distance of the image formed.

a)

10 cm

b)

20 cm

c)

30 cm

d)

40 cm

51.

If the power of a lens is – 2 D, what is its focal length?

a)

+50 cm

b)

-100 cm

c)

-50 cm

d)

+100 cm

52.

You are given three media A, B and C of refractive index 1.33, 1.65 and 1.46. The medium in which the light will travel fastest is

a)

A

b)

B

c)

C

d)

Equal in all media

53.

The refractive index of water is 1.33. The speed of light in water will be:

a)

1.33 × 10^8 m/s

b)

3 × 10^8 m/s

c)

2.66 × 10^8 m/s

d)

2.26 × 10^8 m/s

54.

When a light ray is travelling from denser medium to rarer medium, it -----------.

a)

bends towards the normal

b)

bends away from the normal

c)

does not bend

55.

A light ray is incident on a glass block as shown. Identify the correct statement.

a)

The glass block is optically denser than the medium outside and the ray bends towards the normal.

b)

The glass block is optically less dense than the medium outside and the ray bends away from the normal.

c)

The glass block is optically denser than the medium outside and the ray bends away from the normal.

d)

The glass block is optically less dense than the medium outside and the ray bends towards the normal.

56.

When light travels from air into water, the light bends ____________.

a)

towards the normal line

b)

away the normal line

c)

perpendicular to the normal line

d)

in an odd shape

57.

The quantity which does not changes during refraction is

a)

direction

b)

speed

c)

frequency

d)

wavelength

58.

A light ray does not bend at a boundary between two media of different optical densities if its angle of incidence is

a)

180o

b)

45o

c)

0o

d)

90o

59.

When light passes from one medium into another, refraction occurs. This is because of

a)

reflection of light.

b)

a change in color of the light.

c)

a change in velocity of the light.

d)

the absorption of light.

60.

The diagram shows a ray of light going from medium A into medium B. Which one of the following statements cannot be correct?

a)

A is air and B is glass.

b)

A is water and B is vacuum.

c)

A is water and B is air.

d)

A is glass and B is vacuum.

61.

A ray of light is shone on a rectangular glass block as shown. Identify A, B and C.

a)

A = Refracted ray, B = Incident ray, C = Normal

b)

A = Incident ray, B = Refracted ray, C = Normal

c)

A = Normal, B = Refracted ray, C = Incident ray

d)

A = Refracted ray, B = Angle of incidence, C = Angle of refraction

62.

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

63.

Diagram shows a phenomenon occurs when the spotlight is directed onto a mirror surface. What is the principle of light shown in the situation?

a)

Light travels in a straight line

b)

Refraction of light

c)

Reflection of light

d)

Light travels in parallel

64.
Light bending as it passes from one medium (object) to another is...
a)
Refraction
b)
Reflection

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