A ray of light refracts from medium 1 into a thin layer of medium 2, crosses the layer and is incident at the critical angle on the interface between the medium 2 and 3 as shown in the figure. IF the angle of incidence of ray is theta the value of of theta is:

A ray of light refracts from medium 1 into a thin layer of medium 2, c

1.	A ray of light refracts from medium 1 into a thin layer of medium 2, crosses the layer and is incident at the critical angle on the interface between the medium 2 and 3 as shown in the figure. IF the angle of incidence of ray is theta the value of of theta is:
Answer» `sin^-1 (8/9)` `sin^-1 (13/18)` `sin^-1(13/16)` `sin^-1(8/13) ANSWER :D