Question

Polarising angle for water is ${53}^o{4}^{\prime }$. If light is incident at this angle on water and reflected, the angle of refraction is :

• A. ${126}^o{56}^{\prime }$
• B. ${36}^o{56}^{\prime }$
• C. ${30}^o$
• D. ${36}^o{20}^{\prime }$

Answer 1

The correct option is B ${36}^o{56}^{\prime }$

Polarising angle for water, $i_p={53}^o{4}^{\prime }$

Angle of refraction, $r={90}^o-i_p$

$\Rightarrow$ $r={90}^o-{53}^o{4}^{\prime }$

$\Rightarrow r={89}^o{60}^{\prime }-{53}^o{4}^{\prime }={36}^o{56}^{\prime }$