it is necessary to illuminate the bottom of a well by reflected solar beam when the light is incident at an angle of Alpha is equals to 40 degree to the vertical at what angle B to horizontal should a plane mirror placed
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It is necessary to illuminate the bottom of a well by reflected solar beam when the light is incident at an angle of alpha = 40 0 to the vertical. At what angle beta to the horizontal should a plane mirror be placed - (a)500 (b)400 (c)700 (d)200
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