Question
Critical angle of light passing from glass to air is minimum for which light
✓
Answer
${\theta _c} = {\sin ^{ - 1}}\left( {1/n} \right)$
$\xrightarrow{VIBGYOR}\lambda \uparrow n\downarrow $
$''n''$ is $max,$ so $''{\theta _c}''$ is $min.$
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