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  4. A ray of light is incident at an angle of 60° on one face of a prism of angle 30°. The emergent ray of light makes an angle of 30° with incident ray. The angle made by emergent ray with second face of prism be

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Q. A ray of light is incident at an angle of 60° on one face of a prism of angle 30°. The emergent ray of light makes an angle of 30° with incident ray. The angle made by emergent ray with second face of prism be

JIPMERJIPMER 2010Ray Optics and Optical Instruments

Solution:

Here, $i = 60°, A = 30°, \delta = 30°, e = ?$
As $i + e = A + \delta$
$\therefore \:\: e = A + \delta - i = 30° + 30° - 60° = 0°$
Angle of emergent ray with second face of prism $= 90° - 0° = 90°$