When an equilateral prism of refractive index 2 produces minimum deviation the angle of incidence at the first face must be

Step-by-step solution

The angle of minimum deviation is given by aligned _m & =(n-1) A _m & =( 2 -1) 60 aligned Angle of incidence, i= A+ _m 2 aligned & i= 60+( 2 -1) 60 2 & i= 60 2 2 =30 2 =42^ aligned