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1. Why do we see a rainbow in the sky only after rainfall?
of sunlight by tiny water droplets present in the atmosphere lead to the formation of rainbow.
A rainbow is continually set in a direction to that of the Sun. The water droplets behave like small prisms. They get and the incident sunlight, then internally it gets , and finally, get refracted again when it comes out of the raindrop.
2. Why is the colour of the clear sky blue?
Blue colour in the white light suffers scattering. Due to this, it is the blue colour which . This is the reason why makes the sky appears blue
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