When a glass prism of refracting angle 60^ is immersed in a liquid its angle of minimum deviation is 30^ . The critical angle of glass with respect to the liquid medium is

Step-by-step solution

A=60^ , =30^ Refractive index of prism with respect to liquid, aligned & = A+ _n 2 A 2 = (60^ +30^ ) 2 60^ 2 & = 45^ 30^ = 1 2 1 2 = 2 aligned Critical angle = ⁻¹ ( 1 )= ⁻¹ ( 1 2 )= ⁻¹ ( 45^ )=45^