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