NDA 2026 Physics question

A periscope uses two plane mirrors inclined at 45°. If the tube of the periscope is filled with a complete transparent liquid of refractive index 1·5, then which one of the following is correct in respect of the image seen?

(A)The image will remain unchanged.Correct
(B)The image will appear laterally shifted.
(C)The image will appear 1·5 times brighter.
(D)The image will appear 1·5 times darker.

Answer: (A)

Solution

The law of reflection (angle of incidence = angle of reflection) does not depend on the medium in front of the mirror, and

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Question ID VK-033259