It is necessary to illuminate the bottom of a well by reflected solar beam when the light is incident at - Science - Light - Reflection and Refraction

Question

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

Jyoti Pant · Accepted Answer

<img alt="" src=
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It is clear,
i+ r=i + i=140
Or i=70 degree
Thus, plane mirror makes an angle of 20 degree with vertical and 70
degree with horizontal
Therefore, the correct option is (c)

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

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