Question

For a given incident ray, the plane of the mirror makes an angleθwith the incident ray, then the reflected ray is turned through2θ.Which of the following is based on the above principle a. Periscope
b. Kaleidoscope
c. Shaving mirrors
d. Automobile head lights

Answer 1

Answer:

Consider a plane-mirror and a fixed incident ray of light reflecting from the surface at an angle . Before the mirror has rotated, the angle of incidence is is the angle of reflection. If the mirror is rotated through an angle the normal is rotated by an angle and thus the angle of incidence increases to +. Therefore, the angle of reflection must also increase by tow The difference between the final angle of reflection and the initial angle of reflection and is 2θ.

Explanation:

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