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JEE Main202126 Feb 2021Evening ShiftPhysicsRay OpticsActual

A point source of light S , placed at a distance 60   cm infront of the centre of a plane mirror of width 50   cm , hangs vertically on a wall. A man walks infront of the mirror along a line parallel to the mirror at a distance 1 . 2   m from it (see in the figure). The distance between the extreme points where he can see the image of the light source in the mirror is__ cm

Correct answer

150

Step-by-step solution

tan θ = 25 60 = x 180 x = 75   cm so distance between extreme point = 2 x = 2 × 75 = 150   cm

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