Angle of Deviation in Prism

Q.

Define the term angle of deviation.

Q. Define incident ray?

Q.

Angle of minimum deviation is equal to the angle of prism A of an equilateral glass prism. The angle of incidence at which minimum deviation will be obtained is

1. ${60}^{\circ }$

2. ${45}^{\circ }$

3. $si{n}^{-1}\left(\frac{2}{3}\right)$

4. ${30}^{\circ }$

Q.

Write a relation for the angle of deviation $\delta$ for a ray of light passing through an equilateral prism in terms of the angle of incidence (i_1), angle of emergence (i_2) and angle of prism (A).

Q. If angle of incidence is greater than critical angle, then _____ happens.

1. Reflection
2. Refraction
3. TIR
4. All of these

Q.

A graph is plotted between the angle of deviation ( $\delta$) and angle of incidence ($i$) for a prism. The nearly correct graph is

1. 

2. 

3. 

4. 

Q.

A prism $(\mu =1.5)$has the refracting angle of 30°. The deviation of a monochromatic ray incident normally on its one surface will be (sin48° 36' = 0.75)

1. 18° 36'

2. 20° 30'

3. 22°1'

4. 18°

Q.

What is optical density?

Q.

(a) How does the angle of deviation produced by a prism change with an increase in the angle of incidence? Draw a curve showing the variation in the angle of deviation with the angle of incidence at a prism surface.

(b) Using the curve in part (a) above, how do you infer that for a given prism, the angle of minimum deviation ${\delta }_{min}$ is unique for the given light.

Q.

The process by which a beam of white light splits into its constituent colours is known as reflection.

1. Reflection

2. Dispersion

Q.

What is angle of deviation?

1. The angle between the refracted ray extended forward & the emergent ray extended backward is called angle of deviation.

2. The angle between the refracted ray extended backward & the emergent ray extended backward is called angle of deviation.

3. The angle between the incident ray extended forward & the refracted ray extended forward is called angle of deviation.

4. The angle between the incident ray extended forward & the refracted ray extended backward is called angle of deviation.

5. The angle between the incident ray extended forward & the emergent ray extended backward is called angle of deviation.

Q.

The angle between the normal at the point of incidence and the reflected ray is known as:

1. Angle of Incidence

2. Angle of Reflection

3. Angle of Refraction

4. It depends on the type of mirror

Q.

If an angle of incidence is at ${30}^{\circ }$. Find the angle of deflection, after reflecting 2 times.

1. 270º

2. 360º

3. 240º

4. 180º

Q.

A ray of light incident at an angle of incidence $i_1$ passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges at an angle of emergence$i_2$. (i) How is the angle of emergence '$i_2$' related to the angle of incidence '$i_1$'? (ii) What can you say about the angle of deviation in such a situation?

Q.

The process by which a beam of white light splits into its constituent colours is known as ________.

1. Reflection

2. Dispersion

3. Divergence

4. Convergence

Q.

An object placed in one medium when seen from the other medium, it appears to be vertically shifted. Which of the following factors determines the magnitude of shift?

1. Wavelength of the incident light

2. Refractive index of the medium

3. All of the above

4. Thickness of the denser medium

Q.

Complete the following sentence:

Angle of deviation is the angle which the .................ray makes with the direction of ................ray.

Q.

How does the deviation produced by a triangular prism depend on the colour (or wavelength) of light incident on it ?

Q.

The process by which a beam of white light splits into its constituent colours is known as_________.

1. Convergence

2. Reflection

3. Dispersion

4. Divergence

Q.

Angle of a prism whose one surface is ${30}^{\circ }$ and its refractive index is $\sqrt{2}$. At what angle of incidence, a ray should be incident on the surface so that after reflection from the silvered surface, it retraces its path

1. 30°
2. 60°
3. 
4. 45°

Q.

A light ray changes enters Medium 2 from Medium 1. What would be the deviation if the refractive index of Medium 1 and Medium 2 are same?

Q. How do we see the image of the sky in a pool of water?

Q.

A ray of light is incident on the surface of a glass plate at an angle of incidence equal to Brewsters angle, then the angle between reflected and refracted rays is

Q.

Draw a ray diagram to show the refraction of light through a glass prism.

On the diagram mark a) Incident angle b) emergent ray c) angle of deviation.

Q. An isosceles glass prism having refractive index $\mu$ has one of its faces coated with silver. A ray of light is incident normally on the other face(which is equal to the silvered face). The ray of light is reflected twice on the same sized faces and then emerges through the base of the prism perpendicularly. The angles of the prism are:

1. ${40}^o,{70}^o,{70}^o$
2. ${50}^o,{65}^o,{65}^o$
3. ${36}^o,{72}^o,{72}^o$
4. Data insufficient

Q.

A light ray is incident on an equilateral prism of refractive index 5/3. What should be the angle of incidence such that the ray gazes on the second surface?

1. $si{n}^{-1}\left(\frac{1}{3}\right)$
2. $si{n}^{-1}\left(\frac{2}{3}\right)$
3. $si{n}^{-1}\left(\frac{2}{5}\right)$
4. $si{n}^{-1}\left(\frac{4}{5}\right)$

Q. The refractive index of a prism for a monochromatic wave is $\sqrt{2}$ & its refractive angle is ${60}^o$ . For a minimum deviation, the angles of incidence will be:

1. ${30}^o$
2. ${45}^o$
3. ${60}^o$
4. ${75}^o$

Q. The angle between the incident ray reflected ray is ${60}^o$. What is the angle of incidence ?

Q. At the position of minimum deviation what is relation between angle of incidence and angle of emergence ?

Q.

The cross-section of a glass prism has the form of an isosceles triangle. One of the refracting faces is silvered. A ray of light falls normally on the other refracting face. After being reflected twice, it emerges through the base of the prism perpendicular to it. The angles of the prism are

1. ${45}^0,{45}^0,{90}^0$
2. ${72}^0,{72}^0,{36}^0$
3. ${54}^0,{54}^0,{72}^0$
4. ${57}^0,{57}^0,{76}^0$