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NEET PHYSICSEasy

Pick the wrong statement in the context with a rainbow.

A

Rainbow is a combined effect of dispersion, refraction, and reflection of sunlight.

B

When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed.

C

The order of colors is reversed in the secondary rainbow.

D

An observer can see a rainbow when his front is towards the sun.

Step-by-Step Solution

  1. Formation of Rainbow: A rainbow is a natural spectrum appearing in the sky after a rain shower. It is caused by the dispersion, refraction, and internal reflection of sunlight by spherical water droplets acting as prisms.
  2. Primary vs. Secondary:
  • Primary Rainbow: Involves one internal reflection. Violet is on the inner edge and Red on the outer edge.
  • Secondary Rainbow: Involves two internal reflections inside the droplet (Statement 2 is correct). Due to the extra reflection, the intensity of light is reduced, and the order of colors is reversed (Red is on the inner edge, Violet on the outer) (Statement 3 is correct).
  1. Condition for Visibility: For an observer to see a rainbow, the sun must be behind them. The observer must look away from the sun towards the rain. If the observer faces the sun, they cannot see the rainbow (Statement 4 is incorrect).
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