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Light — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceLight1 Mark
MCQ
How is a rainbow formed?
  • A
    When raindrops absorb sunlight.
  • B
    When raindrops reflect sunlight.
  • ✓
    When raindrops disperse sunlight.
  • D
    When raindrops diffract sunlight.
✓

Answer

Correct option: C.
When raindrops disperse sunlight.
The dispersion of sunlight is the splitting of white light into rays of seven different colours. Just after the rain, there are a large number of water drops in the air which act like small prisms. As the white sunlight enters these water drops, the constituents of white light of different colours are refracted by different amounts, and a band of seven colours called rainbow is formed.

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