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Asked by sarveshvibrantacademy | 26 Apr, 2019, 09:40: AM
answered-by-expert 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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