The deflection of a DArsonval galvanometer is measured through a mirror and scale.
The mirror is 1 m away from the light source.
The mirror is mounted on, the moving system.
If mirror rotates through 0.2 rad the displacement on the scale is
A. 0.2 m
B. 0.4 m
C. 0.1 m
D. 0.05 m
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