Question

The critical angle for light going from medium (i) to (ii) is $\theta$. The speed of light in a medium (i) is $\nu$, then the speed of light in a medium (ii) is

• A. $\nu (1-cos\theta )$
• B. $\frac{\nu }{sin\theta }$
• C. $\frac{\nu }{cos\theta }$
• D. $\frac{\nu }{(1-sin\theta )}$

Answer 1

The correct option is B $\frac{\nu }{sin\theta }$

$sin\theta =\frac{{\mu }_2}{{\mu }_1}=\frac{v}{v^{\prime }}or{v}^{\prime }=\frac{v}{sin\theta }$
where v and v' are the speeds of light in medium (i) and medium (ii) respectively.