The angle between two flat mirrors is changed by rotating one of the mirrors around the edge of another with a constant angular velocity ω = 1.5 deg / sec . Source of light S is located as shown in Fi

Question

The angle between two flat mirrors is changed by rotating one of the mirrors around the edge of another with a constant angular velocity ω = 1.5 deg / sec . Source of light S is located as shown in Figure, the distance h = 10 cm . At the initial moment mirrors were in the same plane ( ϕ = 18 0 ∘ ).

TestHub · Accepted Answer

A ray reflected by a mirror rotating at $ω$ turns at $2 ω$ ; successive reflections between the two mirrors multiply the effect.

Track the image positions from S as the mirror angle opens from $ϕ = 18 0^{\circ}$ with $h = 10 cm$ .

Evaluating the image speed and direction at the instants asked gives (A), (B) and (D).

Answer: A,B,D

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