Question

A ray of light is incident at the glass-water interface at an angle $i$, emerges finally parallel to the surface of water, then the value of refractive index of glass, ${\mu }_g$ would be :

• A. $\frac{4}{3}\sin i$
• B. $\frac{1}{\sin i}$
• C. $\frac{4}{3}$
• D. $1$

Answer 1

The correct option is B $\frac{1}{\sin i}$

$sinr\times {\mu }_{\omega }={\mu }_a\times 1$

$sinr=\frac{3}{4}$

$sini\times {\mu }_G=1$

${\mu }_G=\frac{1}{sini}$