A parallel beam of light is incident normally on the flat surface of a hemisphere of radius `6 cm` and refractive index `1.5`, placed in air as shown in figure (i). Assume paraxial ray approxiamtion.
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Options

A. The rays focused at `12 cm` from the point `P` to the right, in the situation as shown in figure `(i)`
B. The rays focused at `16 cm` from the point `P` to the right, in the situation as shown in figure `(i)`
C. If the rays are incident at the curved surface (figure `(ii)`) then are focused at distance `18 cm` from point `P` to the right.
D. If the rays are incident at the curved surface (figure `(ii)`) then are focused at distance `14 cm` from point `P` to the right.

Answer

A, D

Explanation

N//a