Dispersion of Light

Q.

What is the formula for dispersive power?

Q.

Arrange the following colours in the increasing order of their wavelengths.

Violet, Red, Green, Blue

1. Violet < Blue < Green < Red

2. Violet < Blue < Red < Green

3. Blue < Violet < Green < Red

4. Violet < Green < Blue < Red

Q.

In the dispersion of light through a glass prism, which colour has the maximum deviation? [1 MARK]

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

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

Q.

The angle of polarisation of a medium is $60°$. What will be critical angle for this?

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

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

3. ${\cos }^{-1}\left(\sqrt{3}\right)$

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

Q.

The splitting of white light into its constituent colors is called dispersion.

1. True

2. False

Q.

a dichromatic light of wavelength 5600A and 6300A pass through a prism of crown glass. then compare the deviation of both the lights

Q.

State Snell’s law of refraction

Q.

Statement 1: When a white light ray passes through a prism it disperses into seven different colours, and this phenomenon is called dispersion.

Statement 2: Refraction depends upon the wavelength of light and since different colours have different wavelengths, they are refracted at a different angle.

1. Statement 1 and statement 2 is correct

2. Statement 1 is incorrect and statement 2 is correct

3. Statement 1 and statement 2 is incorrect

4. Statement 1 is correct and statement 2 is incorrect

Q.

What are the different factors on which the angle of deviation depends?

Q. Question 29
Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagram.

Q.

Differentiate between a glass slab and a glass prism.

Q.

Why the colour of the sky is blue?

Q.

Why LASER cannot be dispersed?

1. Because it is a combination of Violet and Red colour

2. Because it is a composite

3. Because it is not composite

4. Because it is a combination of Orange and Red

Q.

A prism splits a beam of white light into seven colours because different colours have different

Q. Which of the following is not an application of Infrared Rays?

1. TV remote control
2. Night vision
3. Optical Fiber
4. Long distance communication

Q. Consider the following statements:

1. White light on passing through a prism, disperses into seven colours, in a phenomenon called dispersion.


2. Different wavelengths of light are refracted at different angles in the same medium.

1. Both the statements are correct, and 2 is not the correct reason of 1.

2. Both the statements are correct, and 2 is the correct reason of 1.
3. Both statements are wrong.
4. Statement 1 is correct but statement 2 is not.

Q.

State True or False:

The splitting of white light into its component colours is called dispersion.

1. True
2. False

Q.

What is the refractive index of alcohol?

Q.

What are primary and secondary colors of light?

Q.

The phenomenon of splitting white light into seven colours is called?

1. Reflection

2. Refraction

3. Refractive index

4. Dispersion

Q. the a​bsolute refractive index of benzine and kerosine are 1.50 and 1.44 respectively what is the refractive index of benzine with respect to kerosine?

Q. Arrange the following colors in ascending order of their deviation through prism.

1. Red
2. Green
3. Blue
4. Yellow
5. Violet

Q.

What is the meaning and importance of traffic signal light?

Q. The critical angle for glass-water surface is (refractive index of glass = 1.5 and refractive index of water $=\frac{4}{3}$)

1. $si{n}^{-1}\left(\frac{8}{9}\right)$
2. $si{n}^{-1}\left(\frac{9}{8}\right)$
3. $si{n}^{-1}\left(\frac{2}{3}\right)$
4. $si{n}^{-1}\left(\frac{4}{3}\right)$

Q.

Dispersion of light can be defined as the separation of white light beam into its seven constituent colors.

1. True
2. False

Q.

How does refraction take place in the atmosphere? Why do stars twinkle but not the planets?

Q. Monochromatic light refers to light that has ___.

1. white and orange colour
2. only one colour
3. all colours
4. red and blue colour

Q.

A given ray of light suffers minimum deviation in an equilateral prism P . Additional prism Q and R of identical shape and of the same material as P are now added as shown in fig . The rays will now

1. Greater deviation

2. No deviation

3. Same deviation as before

4. Total Internal reflection

Q.

In an equilateral prism, the angle of incidence is 45⁰ and the angle of emergence is 55⁰. The angle of deviation of the ray of light is

1. $45°$

2. $40°$

3. $35°$

4. $50°$