Which of the following diagrams does illustrate what happens when a ray of light meets an air-water boundary? a
A
b
B
c
C
d
D
Question 11 (1 point)
The diagram shows light travelling from air into glass.

Four angles V , W , X and Y are shown.

Which formula is used to calculate the refractive index , n , of the glass ?

a
n = sin w / sin x
b
n = sin v / sin y
c
n = sin w / sin y
d
n = sin v / sin x
Question 12 (1 point)
Light travels in a vacuum and then enters a glass block. The speed of the light in the glass block is 2.0 × 10 8 m s -1.

Which statement about the speed of light is correct?

a
The speed in the glass is 1.5 times the speed in the vacuum
b
The speed in the vacuum is 1.5 times the speed in the glass
c
The speed in the vacuum is same as the speed in the glass
d
The speed in the glass is 1.0 × 10 8 times the speed in a vacuum.
Question 13 (1 point)
A ray of light in air strikes a glass boundary at an angle of 0° . The light will be:

a
totally reflected
b
undeviated
c
refracted at an unknown angle
d
refracted at 90 degrees to the normal
Question 14 (1 point)

Light travelling in glass is incident on the glass-air boundary as shown. The angle of incident of the light is greater than the critical angle.

Which arrow shows the direction of the light after it is incident on the boundary ?

a
A
b
B
c
C
d
D
Question 15 (1 point)
Which diagram best shows the path taken by the ray of light through the rectangular glass block ?

a
A
b
B
c
C
d
D
Question 16 (1 point)
A ray of light entering the eye changes direction. Thia effect is called:

a
Refraction
b
Interference
c
Reflection
d
Diffraction
Question 17 (1 point)
Total internal reflection in a medium occurs only when the angle of incidence:

a
equals the angle of refraction
b
equals 90
c
is less than the critical angle
d
is greater than the critical angle
Question 18 (1 point)
_ Which of the following statements MUST be true if total internal reflection is to occur?

I. The angle of refraction must be 90º

II. The angle of incidence must be equal to the angle of refraction

III. The angle of incidence must be greater than the critical angle

IV. Light must be travelling from one medium to a less optically dense medium.

a
III and IV only
b
I and II only
c
I and III only
d
II and III only
Question 19 (1 point)
A ray of light travels from air to glass as shown.

The speed of light in air is 3.00 x 10 8 m s-1.

What is the speed of light in the glass ?

a
3.00 x 10 8 m/s
b
2.00 x 10 8 m/s
c
4.24 x 10 8 m/s
d
2.12 x 10 8 m/s