Refraction of Light

Q. A ray of light is incident at an angle of 60° on one face of a prism of angle 30°. The ray emerging out of the prism makes an angle of 30° with the incident ray. The emergent ray is

1. Normal to the face through which it emerges
2. Inclined at 30° to the face through which it emerges
3. Inclined at 60° to the face through which it emerges
4. None of these

Q.

A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water Will the pencil appears to be bent to the same extent if instead of water we use liquid like kerosene or oil ?

Q.

Refractive index of glass is 1.6 and that of diamond 2.4. Find the refractive index of glass with respect to diamond and diamond with respect to that of glass

Q. the least angle of deviation for a glass prism is equal to its refracting angle . the refractive index of Glass is 1.5 then the angle of prism is

Q.

Explain the refraction of light through a triangular glass prism using a labeled ray diagram. Hence define the angle of deviation.

Q. Why does light bend after refraction?

Q. What is an angstrom?

Q. Calculate the ratio of maximum wavelength of Lyman and Balmer series ?

Q.

The diagram given below shows a right-angled prism with a ray of light incident on the side AB. (The critical angle for glass is 42°). The path of the ray of the light ray out of the glass prism is such that the value of the angle of deviation shown by the ray is

1. 180^o

2. 90^o

3. 0^o

4. 270^o

Q.

Bending of light from its original path while traveling from one medium to another is called:

1. Diffraction of light

2. Deflection of light

3. Reflection of light

4. Refraction of light

Q. There is a prism with refractive index equal to $\sqrt{2}$ and the refracting angle equal to 30°. One of the refracting surfaces of the prism is polished. A beam of monochromatic light will retrace its path if its angle of incidence over the refracting surface of the prism is

1. Zero
2. 30°
3. 45°
4. 60°

Q. Optical fibres are based on

1. Scattering of light
2. Dispersion of light
3. Refraction of light
4. Total internal reflection

Q.

Refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5. find out the absolute refractuve index of diamond?

Q. A disc is placed on the surface of a pond filled with liquid of refractive index $\frac{5}{3}$. A source of light is placed 4 m below the surface of the liquid. The minimum area of the disc so that light does not come out of the liquid into air is about

1. $28.26m^2$
2. $26.28m^2$
3. $28.26c{m}^2$
4. $26.28c{m}^2$

Q.

After refraction through a rectangular glass slab the emergent ray is ___________.

Q.

In the diagram below, PQ is a ray of light incident on a rectangular glass block.

In the diagram, the angle of incidence is marked by letter 'i' and the angle of emergence by the letter 'e’.

How are the angles' i’ and 'e’ related to each other?

1. i > e

2. i < e

3. I + e = 90^o

4. i = e

Q.

When the light ray is ___________ to the boundary between two medium, light does not bend.

1. oblique

2. parallel

3. curved

4. normal

Q. Refractive index of medium b with respect to medium a is 2. The refractive index of medium c with respect to b is 3. What is the refractive index of medium c with respect to a?

Q. State the factors on which the colour of the scattered light depends. Explain why the sky appears blue.

Q. In the figure shown, for an angle of incidence 45° at the top surface, what is the minimum refractive index needed for total internal reflection at vertical surface?

1. $\frac{\sqrt{2}+1}{2}$
2. $\sqrt{\frac{3}{2}}$
3. $\sqrt{\frac{1}{2}}$
4. $\sqrt{2}+1$

Q.

Rakesh wanted to do the prism experiment, he took a prism and passed a monochromatic light through the prism. Which of the following phenomenon would he observe?

1. Dispersion

2. Refraction

3. Diffraction

4. Reflection

Q.

If Ram is facing west and he sees a rainbow in front of him then, in which direction most probably the Sun is?

1. North

2. South

3. West

4. East

Q. In which of the following process, the splitting of white light take place?

1. Refraction
2. Reflection
3. Dispersion
4. Interference

Q. A prism with greater refractive index produces a greater angle of deviation.

1. True
2. False

Q. Explain why:
When a pencil is partly immersed in water and held in a slanting position, it appears to be bent at the boundary separating water and air.

Q.

A ray of light $PQ$ is incident on the face $AB$ of an equilateral glass prism $ABC$ as shown in the figure. Show that angle of emergence=angle of deviation. Also, with a ray diagram, trace the path of the emergent ray.

Q. As the density of a medium increases, its refractive index ___.

1. increases
2. decreases
3. remains same
4. either increases or decreases

Q. As the density of a medium increases, its refractive index .

1. remains same
2. increases
3. decreases

Q.

The angle of minimum deviation for a prism of refractive index $1.5$ is equal to the angle of the prism. The angle of the prism is (cos 41° = 0.75)

1. 62°

2. 41°

3. 82°

4. 31°

Q.

The bending of light at the surface of two transparent media. (Write the name)