Question

A ray light is incident at the glass water interface at an angle i, it emerges finally parallel to the surface of water, than the value of μg would be 

(a) (4/3) sin i 

(b) 1/ sin i 

(c) 4/3 

(d) 1  

Answer 1

Correct option is (b) μg =1/sin i 

Explanation:

Apply Snell’s law at surface 1 and 2 

μg sin i=μa sin 90 

μg =1/sin i