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:
$ _{a}{\mu _{g}}=\frac{1}{\sin C}\Rightarrow \sin C=\frac{1}{ _{a}{\mu _{g}}} $
As $ \mu $ for violet colour is maximum, so sin C is minimum and hence critical angle $ C $ is minimum for voilet colour.
