Free Printable AQA A Level Physics 3.3.2.3 Refraction at a plane surface

1.

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 enters and leaves the water

c)

bends when it is inside water

d)

reflects the pencil on the water's surface

2.

Speed of light in a vacuum, $c$

a)

$3\times10^8ms^{-1}$

b)

$3\times10^{12}ms^{-1}$

c)

$3\times10^6ms^{-1}$

d)

$3\times10^{10}ms^{-1}$

3.

Refractive index, $n$

a)

$n=c_sc$

b)

$n=\frac{c_s}{c}$

c)

$n=\frac{c}{c_s}$

d)

$c_s=nc$

4.

The refractive index will always be:

a)

$n<1$

b)

$n\ge1$

c)

$n=1$

d)

$n=0$

5.

Light travels through a liquid at $2.25\times10^8ms^{-1}$ .
What is the refractive index of the liquid?

a)

$1.33$

b)

$1.00$

c)

$1.52$

d)

$2.45$

6.

As light enters these materials it...

a)

continues its straight line path

b)

bends toward the normal

c)

bends away from the normal

d)

reflects

7.

A

a)

angle of incidence

b)

reflected ray

c)

incidence ray

d)

refracted ray

e)

normal

8.

B

a)

angle of refraction

b)

reflected ray

c)

incidence ray

d)

refracted ray

e)

angle of incidence

9.

C

a)

angle of refraction

b)

angle of reflection

c)

incidence ray

d)

refracted ray

e)

angle of incidence

10.

D

a)

reflected ray

b)

angle of reflection

c)

incidence ray

d)

refracted ray

e)

angle of incidence

11.

E

a)

reflected ray

b)

angle of reflection

c)

incidence ray

d)

refracted ray

e)

angle of incidence

12.

F

a)

reflected ray

b)

angle of reflection

c)

incidence ray

d)

refracted ray

e)

angle of incidence

13.

G

a)

reflected ray

b)

angle of reflection

c)

incidence ray

d)

refracted ray

e)

angle of incidence

14.

What is the index of refraction of a liquid if the angle of incidence in air is $35\degree$ and the angle of refraction is $14\degree$ ?

a)

$1.33$

b)

$2.21$

c)

$2.37$

d)

$1.72$

15.

Optical fibres operate on the principle of...

a)

Diffraction

b)

Total internal reflection

c)

Interference

d)

Total internal refraction

16.

What happens to light during total internal reflection?

a)

The angle of incidence exceeds the critical angle

1.

$\theta_1>\theta_c$

b)

The refracted ray is refracted beyond what is possible

2.

$\theta_2>90\degree$

c)

All the light is internally reflected.

3.

$\theta_i=\theta_r$

17.

Which diagram correctly describes the critical angle $\theta_c$ for an air-water interface?

a)

A

b)

B

c)

C

d)

D

18.

The refractive index of a glass rod in air is $n=1.9$ . What is the critical angle?

a)

23^o

b)

30^o

c)

32º

d)

35^o

19.

Match the functions

a)

Lower index of refraction to enable reflection

1.

Cladding

b)

Regenerates the light signal

2.

Repeater

c)

Carries the light signal

3.

Core

d)

Emits the light signal

4.

Transmitter

e)

The destination of the light signal

5.

Receiver

20.

Match the problems in fibre optics:

a)

Different wavelengths have different travel times

1.

Material dispersion

b)

Different paths have different travel times

2.

Modal dispersion

c)

The signal is attenuated because the core is not 100% transparent

3.

Absorption

d)

Signals elongate and may overlap due to travel time differences

4.

Pulse broadening

AQA A Level Physics 3.3.2.3 Refraction at a plane surface

Total questions: 20

Worksheet time: 14mins

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