2019 Ray Optics and Optical InstrumentsRefraction of Light – Natural Phenomena (Rainbow) Medium Question 33 of 89 in Ray Optics and Optical Instruments

Pick the wrong answer in the context with rainbow.

A When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed.
B The order of colours is reversed in the secondary rainbow.
C An observer can see a rainbow when his front is towards the sun.
D Rainbow is a combined effect of dispersion refraction and reflection sunlight.

The answer is C.

Solution

A rainbow is seen only when the sun is behind the observer, i.e. the observer faces away from the sun. So the statement "An observer can see a rainbow when his front is towards the sun" is wrong. The other statements (secondary rainbow from two internal reflections

Concept formation of a rainbow

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89 questions from this chapter have appeared across 25 exam years.