Question

Why do we get seven colours when the light passes through a glass prism ?
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Answer 1

Answer:

due to the occurrence of the phenomenon splitting of white light

Answer 2

Answer:

When we keep a prism in from of sunlight or any source of white light, we obtain an array of seven colours.

We can see the splitting of white light into seven colours.

Why?

This is because white light consists of seven colours. Therefore bringing a glass prism close to it helps in the splitting of the seven colours that forms white light.

What are the seven colours?

The seven colours are the so called rainbow colours.

1. Violet
2. Indigo
3. Blue
4. Green
5. Yellow
6. Orange
7. Red

Yet, even if there are seven colours we see different things in different colours separately.

This is because, the material absorbs the colours that compose the white light.

For example, we say a book is yellow because, when the seven coloured white light falls on the book, all the seven colours are absorbed by the molecules of the book other than the yellow colour due to its chemical composition. Hence the book looks yellow.