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  4. Critical angle of light passing from glass to air is maximum for :-

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Q. Critical angle of light passing from glass to air is maximum for :-

Ray Optics and Optical Instruments

Solution:

$\theta_{ C } \propto \frac{1}{\mu}$ and $\mu \propto \frac{1}{\lambda}$
$\theta_{ C }$ is minimum for violet and maximum for red.