Light incident normally on a plane mirro...

Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards as shown in Fig. 9.33. A current in the coil produces a deflection of `3.5^(@)` of the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m away?

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The reflected rays get deflected by twice the angle of rotation of the mirror. Therefore, `d//1.5 = tan 7^(@)`. Hence `d = 18.4 cm.`

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