Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards
Channel: Doubtnut
Date: 2020-08-02

Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards a shown in Fig. 6(a). 14. A current in the coil produces a deflection of `3.5^(@)` in the mirror. What is the displacement of the reflected spot of light on a screen placed `1.5 m` away ?