Question

5. (i) Why do we see a rainbow after rainfall?

(ii) Imagine a boy sees a signal that comprises red, green and blue colours. He then recedes away

continuously from it. After sometime, which is the first and second colour out of the three colours that

becomes invisible to the boy?

(iii) Give reasons.

(iv) Explain with a diagram, how did Newton show that the white light is a combination of seven colours​

Answer 1

Answer:

1. After a shower of rain, rain drops are suspended in air and when a ray of light enters this drop, the drop acts as a prism and splits into its component colors as dispersion takes place. Lights of different colours emerge from the rain drops such as red at the top and violet at the bottom. Thus, a rainbow is formed.

Answer 2

Answer:

1.A rainbow requires water droplets to be floating in the air. That's why we see them right after it rains. The Sun must be behind you and the clouds cleared away from the Sun for the rainbow to appear.

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