1.

When a plane mirror is placed horizontally on level ground at a distance of 60 m from the foot of a tower, the top of the tower and its image in the mirror subtend an angle of 90 degree at the eye. The height of the tower is:

A. 130 m
B. 60 m
C. 90 m
D. 120 m
Answer» C. 90 m


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