Question

a plane mirror is placed horizontally on level ground at a distance of 60m from the foot of a tower light rays from the top of tower falling on the edge of the mirror suffer a deviation of 90° the height of the tower is

Answer 1

See the picture.
yellow line is light ray, blue line is tower, and red line is normal of mirror.
From the picture, we see that the complementary angle of angle of depression of the light ray is 45°.
So,
if AB is the tower, and AC is the distance between the tower and the mirror, then,
$\tan(45 \degree) = \frac{AC}{AB} \\ \implies1 = \frac{60}{AB} \\ or \\ AB = 60 \: \: m$
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Answer 2

hiii

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