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Science · 2023 · 2 marks
CBSE 2023 · Region 2 · Set 1 · Q24
(a) When and where does a rainbow appear in the sky? Draw a labelled ray diagram to show its formation.
(a)
When and where does a rainbow appear in the sky ? Draw a labelled ray diagram to show its formation.
OR
(b)
What is scattering of light ? Why does the clear sky appear blue ?
Marking-scheme solution
(a)
• It is formed after a rain shower.
It is always formed in a direction opposite to that of the Sun.
OR
(b)(i)
The phenomenon of the change in direction of propagation of light caused by large sized molecules/ caused by colloidal particles.
(ii)
When sunlight passes through the atmosphere, fine particles in the air scatter blue light (shorter wavelengths) more than the red colour (longer wavelengths).
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.