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

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 and angle of `90^@` at the eye. The height of the tower is
A. 30 m
B. 60 m
C. 90 m
D. 120 m

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 m

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