Question

What is meant by spectrum of white light? How can we recombine the components of white light after a prism has separated them?

Answer 1

The coloured pattern VIBGYOR formed by a prism by splitting the incident white light is called a spectrum. By having two prisms, inverted to each other, one can recombine the light to get white light again.

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Answer 2

Explanation:

• When white light comes out of the prism, light is spread in a fan shaped beam. This fan shaped beam is termed as a spectrum. Light is said to be dispersed into a spectrum consisting of violet, indigo, blue, green, yellow, orange and red.

1. We can recombine the components of white light by placing an identical inverted prism with parallel to the side from where the components of colour are emerging out as shown in the figure. A beam of white light emerges from the other side of the second prism.