1.

The reflecting surface of two intersecting flat mirrors are at an angle `theta (0^(@) lt theta lt 90^(@))`. As shown in Figure. For a light ray that strikes the horizontal mirror, the emerging ray intersects the incident ray at an angle `beta` . If one of the mirrors is rotated at `(d theta)/(dt) = 1^(@)//s`, then the angle `beta` changes aat the rate of A. `1^(@)//s`B. `2^(@)//s`C. `-1^(@)//s`D. `-2^(@)//s`

Answer» Correct Answer - D
From geometry `beta = (180^(@) - 2 theta)`
So, `(d beta)/(dt) = -(2 d theta)/(dt)`


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