Refractive Index of a Prism

Q.

Critical angle of light passing from glass to air is minimum for ___ colour.

Q.

Which of the following phenomenon is used in optical fibre?

1. Reflection

2. Total Internal Reflection

3. Dispersion

4. Refraction

Q.

A ray of light travelling in the air falls on the surface of a glass slab at an angle ${45}^{\circ }$ with the normal. The refractive index of glass is 1.5. Calculate the angle of refraction.

Q.

Does the frequency of a ray of light change upon refraction.

Q. What is refractive index?

Q. Question 4
The figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is


(a) $\frac{\sqrt{3}}{\sqrt{2}}$
(b) $\frac{\sqrt{2}}{\sqrt{3}}$
(c) $\frac{1}{\sqrt{2}}$
(d) $\sqrt{2}$

Q.

Which is a greater angle of incidence or angle of refraction , when light travels from denser medium to rarer medium.

Q.

A ray of light passes undeviated after refraction from a thin lens when the ray is incident at...................

Q.

If a ray of light enters a glass prism(as shown in the figure) of a refractive index of 1.5, then the speed of light inside the prism will be

1. $0.2\times {10}^{8}m{s}^{-1}$

2. $2\times {10}^{9}m{s}^{-1}$

3. $2\times {10}^{7}m{s}^{-1}$

4. $2\times {10}^{8}m{s}^{-1}$

Q.

A prism of angle $A=1°$ has a refractive index $\mu =1.5$. A good estimate for the minimum angle of deviation is close to $N/10$. Value of $N$ is

Q. It is given that the value of $\left(sini/sinr\right)$ when light enters from medium P to medium Q is less than 1.

1. Not possible
2. P is optically denser than Q
3. Q is optically denser than P
4. P and Q have same optical density

Q.

A ray of light PQ is incident normally on the hypotenuse of a right angled prism ABC as shown in the diagram given below. The ray will be deviated by 180⁰:

An instrument where this action of the prism is used.

1. Periscope

2. Slide Projector

3. Binoculars

4. Kaleidoscope

5. Telescope

Q. A ray of light is incident at an angle of 60${}^{\circ }$on one of the faces of a prism which has an angle of 30${}^{\circ }$. The ray emerging out of prism makes an angle of 30${}^{\circ }$ with the incident ray. The refractive index of material is

1. $1.1$
2. $1.33$
3. $1.5$
4. $1.732$

Q. The angle of incidence for a ray of light at a refracting surface of a prism is ${45}^o$. The angle of prism is ${60}^o$. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are

1. ${45}^o;\frac{1}{\sqrt{2}}$
2. ${30}^o;\sqrt{2}$
3. ${30}^o;\frac{1}{\sqrt{2}}$
4. ${45}^o;\sqrt{2}$

Q. A ray of light passes through an equilateral prism (refractive index 1.5) such that angle of incidence is equal to angle of emergence and the latter is equal to ${3/4}^{th}$ of the angle of prism. The angle of deviation is

1. ${60}^{\circ }$
2. ${30}^{\circ }$
3. ${45}^{\circ }$
4. ${120}^{\circ }$

Q. A prism of refractive index $\sqrt{2}$ has a reflecting angle of ${60}^0$. At what angle must a ray be incident on it so that it suffers minimum deviation?

1. $i={45}^0$
2. $i={60}^0$
3. $i={90}^0$
4. $i={30}^0$

Q.

The absolute refractive index of flint glass is $1.65$ and that of alcohol is $1.36$. What is the refractive index of flint glass with respect to alcohol?

Q. If the refractive index of glass with respect to air is $3/2$, what is the refractive index of air with respect to glass?

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

Q. Question 14
The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in figure. Which one of them is correct?



(a) A
(b) B
(c) C
(d) D

Q. A light ray is an incident at one face of an equilateral prism such that the angle of incidence is ${45}^0$. if the light ray emerges from the other face of the prism by making the same angle with the normal, determine the refractive index of the material of the prism.

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

Q.

Light travels at a constant finite speed of _________ .

Q. A prism of refractive index $\sqrt{2}$ has refracting angle of ${60}^o$. At what angle a ray must be incident one it so that it suffers a minimum deviation?

1. ${45}^o$
2. ${180}^o$
3. ${60}^o$
4. ${90}^o$

Q. If angle of minimum deviation of a prism is equal to refracting angle of the prism, then refractive index $\mu$ of material of prism satisfies

1. $1<\mu <\sqrt{2}$
2. $2<\mu <3$
3. $\sqrt{2}<\mu <2$
4. $1<\mu <\sqrt{3}$

Q. A ray of light is incident at ${60}^o$ on a prism of refracting angle ${30}^o$. The emerging ray is at an angle ${30}^o$ with the incident ray. The value of refractive index of the prism is?

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

Q. During refraction, ________ will not change.

1. frequency
2. Wave length
3. speed of light
4. all the above

Q. For which colour the refractive index of the prism is maximum and minimum ?

Q. What is the refractive index of a prism whose angle $A={60}^o$ and angle of minimum deviation $d_m={80}^o?$

1. ${\tan }^{-1}\left(\sqrt{2}\right)$
2. $\sqrt{2}$
3. ${\sin }^{-1}\left(\sqrt{3}\right)$
4. ${\tan }^{-1}\left(\sqrt{3}\right)$

Q. The angle of minimum deviation for a thin prism with respect to air and when dipped in water will be: ${(}_a{\mu }_g=\frac{3}{2}$ ${}_a{\mu }_w=\frac{4}{3})$

1. $\frac{1}{3}$
2. $\frac{1}{4}$
3. $\frac{1}{2}$
4. $\frac{1}{8}$

Q. If the angle of minimum deviation produced by an equilateral prism is 30${}^{\circ }$, the refractive index of material of prism is :

1. $\sqrt{2}$
2. $1.5$
3. $1.6$
4. $\sqrt{3}$

Q. How does the angle of minimum deviation produced by a prism change with increase in the refracting angle of prism?

1. $increases$
2. $decreases$
3. $increasesthendecreases$
4. $remainssame$