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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 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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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: Hence, the displacement of the...
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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:

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

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