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# Class 10 FRANK Solutions Physics Chapter 2.3 - Dispersion Through a Prism and Electromagnetic Spectrum

Study from Frank Solutions for ICSE Class 10 Physics Chapter 2.3 Dispersion through a Prism and Electromagnetic Spectrum to improve your Physics marks. Relearn terms such as spectrum, dispersion etc. Learn about the scientists who discovered X-rays, radio waves and ultraviolet rays. In this chapter, also get Physics solutions to clearly understand and explain the dispersion of white light by a glass prism.

You can also practise important ICSE Class 10 Physics questions and answers using other TopperLearning resources. These e-learning resources consist of video lessons, solved Physics question papers and online practice tests.

## Dispersion Through a Prism and Electromagnetic Spectrum Exercise 109

### Solution 1

The phenomenon of splitting of white light into its constituent colours is known as dispersion.

### Solution 2

(i) Ultra-violet radiation
(ii) Infra-red radiation

### Solution 3

3 x 108 m/s is the velocity of electromagnetic radiation.

### Solution 4

Light of different colours have different speeds in a medium.
Therefore, the refractive index of glass (the material of prism) is different for different colours of light and the deviation caused by a prism is different for different colours of light.
Violet is deviated the most because in glass, speed of violet is least.
Red is deviated the least because in glass, speed of red is most.

### Solution 5

The colour band obtained on a screen on passing white light through a prism is called the spectrum.

### Solution 7

(i) It passes parallel with respect to the base of the prism.
(ii) The white light shall split into its constituent colours and a spectrum shall be formed.

## Dispersion Through a Prism and Electromagnetic Spectrum Exercise 110

### Solution 9

The colour band obtained on a screen on passing white light through a prism is called the spectrum.

### Solution 10

If a monochromatic light passes through a prism, deviation will occur and not dispersion.

### Solution 11

Dispersion occurs because light of different colour bend through different angles while passing through a glass prism.

(i) Roentgen
(ii) Newton
(iii) Hertz
(iv) Marconi
(v) Hershell
(vi) Ritter

### Solution 16

In vacuum both the colours have the same speed.
In glass, red colour has a greater speed.