Question

A rectangular glass slab ABCD, of refractive index n₁, is immersed in water of refractive index n₂ (n₁>n₂). A ray of light in incident at the surface AB of the slab as shown. The maximum value of the angle of incidence a_max, such that the ray comes out only from the other surface CD is given by

• A.
  
• B.
  
• C.
  
• D.
  

Answer 1

The correct option is A

Ray comes out from CD, means rays after refraction from AB get, total

internally reflected at AD