Answer :


Angle of deflection, θ = 3.5°

Distance of the screen from the mirror, D = 1.5 m

The reflected rays get deflected by an amount twice the angle of deflection i.e.,

2θ = 7.0°

The displacement (d) of the reflected spot of light on the screen is given as:

tan2θ = d/1.5

(Using trigonometric ratio)

d = 1.5 x tan7o

d= 0.184 m = 18.4 cm

Hence, the displacement of the reflected spot of light is 18.4 cm

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