NEET | 2018Geometrical OpticsHard

Question

The refractive index of the material of a prism is 2and the angle of the prism is 30o. One of the two refracting surfaces of the prism is made a mirror inwards , by silver coat ing. A b eam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is :-

Options

A.

60o

B.

45o

C.

30o

D.

zero

Solution


r2 = 0,   r1 = A = 30o
sin i = 2 sin 30o  = 2×12=12
∠i=45o

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