Free Printable Refraction and Refractive Index

1.

At what angle of incidence, does the light pass from the rarer to the denser medium without any deviation?

a)

$45\degree$

b)

$0\degree$

c)

$180\degree$

d)

$90\degree$

2.

Compare the angle of incidence $\angle i$ with the angle of refraction $\angle r$ , when light travels from a rarer to a denser medium.

a)

$\angle i$ = $\angle r$

b)

$\angle i$ < $\angle r$

c)

$\angle i$ $\propto$ $\angle r$

d)

$\angle i$ > $\angle r$

3.

When light passes from a denser medium to a rarer medium, the speed of light

a)

increases

b)

remains the same

c)

becomes zero

d)

decreases

4.

What is the speed of light in vaccum?

a)

3 $\times$ 10¹⁰m/s

b)

3 $\times$ 10⁸m/s

c)

2.5 $\times$ 10⁹ m/s

d)

2.9 $\times$ 10⁶m/s

5.

How is the absolute refractive index $\eta$ of a medium defined? Let c be the speed of light in vaccum, and v be the speed of light in that medium.

a)

η = $\frac{v}{c}$

b)

η = $c\times v$

c)

η = $\frac{c}{v}$

d)

η = $c-v$

6.

What is the unit of refractive index?

a)

meters

b)

seconds

c)

no units

d)

meters per second

7.

Which of the following symbols are used to represent the refractive index of the medium 2 with respect to medium 1.

a)

$_1\mu_2$

b)

$_1\lambda^2$

c)

$_1\eta_2$

d)

$_2\eta_1$

8.

Let $v_1$ be the speed of light in medium 1, and let $v_2$ be the speed of light in medium 2. What is the value of $_2\eta_1$ .

a)

$\frac{v_1}{v_2}$

b)

$v_1\times v_2$

c)

$v_1-v_2$

d)

$\frac{v_2}{v_1}$

9.

How is refractive index related to angle of incedence $i$ , and angle of refraction $r$ , when light travels from medium 1 to medium 2.

a)

$_1\eta_2=\frac{\sin\ i}{\cos\ r}$

b)

$\ _1\eta_2=\frac{\sin\ i}{\sin\ r}$

c)

$\ _2\eta_1=\frac{\sin\ i}{\sin r}$

d)

$\ _1\eta_2=\sin\ \frac{i}{r}$

10.

Speed of light in a material is 2.5 x 10^8 m/s. Find the refractive index of the material.

a)

1.5

b)

1.8

c)

2.0

d)

1.2

11.

The refractive index of glass w.r.t air is $\ _a\eta_g=\frac{3}{2}$ and the refractive index of water w.r.t air is $\ _a\eta_w=\frac{4}{3}$ .

Find the refractive index of glass w.r.t water.

a)

5/4

b)

2/3

c)

3/2

d)

9/8

12.

Which of the following parameters of light, changes when light passes from one medium to other?

a)

Speed

b)

Wavelength

c)

Frequency

d)

Colour

13.

A ray of light falls on a rectangular glass slab. When the ray of light emerges out of the slab, what is the direction of the emergent ray.

a)

In the same line as the incident ray

b)

Parallel to the incident ray

c)

At an angle of 45 degrees to the incident ray

d)

Perpendicular to the incident ray

Refraction and Refractive Index

Total questions: 13

Worksheet time: 8mins

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