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Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards as shown in Fig. 9.36. A current in the coil

Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards as shown in Fig. 9.36. 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? 50 1.5 m

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