Optics Question 963

Question: Critical angle of light passing from glass to air is minimum for

[NCERT 1975; RPMT 1999; MP PMT 2002]

Options:

A) Red

B) Green

C) Yellow

D) Violet

Show Answer

Answer:

Correct Answer: D

Solution:

aμg=1sin⁡C⇒sin⁡C=1aμg

As μ for violet colour is maximum, so sin C is minimum and hence critical angle C is minimum for voilet colour.

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