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Asked by sarveshvibrantacademy | 26 Apr, 2019, 09:40: AM
Expert Answer
(A) mirror moves upwards :- A on wall shifts upwards
when mirror move upwards, angle of incidence at top most point of mirror increases that makes equal increase of angle of reflection.
Hence, on wall, A shifts upwards
(B) mirror moves towards point source O and (C) point source O moves towards mirror :-
on wall AB increases, A shifts upwards, Central spot intensity of reflected light on the wall increases.
when mirror moves towards point source O or if point source O moves towards mirror, distance betweenn them decreases.
This makes increase of angle of incidence both at top end and bottom end of mirror .
Hence angle of reflection has increased to make increased AB on wall.
Hence A shifts upwards, AB increases. Since light source is coming close to mirror more light intensity is reflected,
hence central portion of the reflected light intensity increases.
(D) when both source O and mirror moves away from wall, AB on the wall increases, A shifts upwards.
Reflected light intensity makes angular distribution of light at the wall. As distance bewteen mirror and wall increases,
illuminated area increases on the wall. Hence AB increases, A shifts upwards
Answered by Thiyagarajan K | 27 Apr, 2019, 07:34: AM
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