1.

When a plane mirror is placed horizontally on a level ground at a distance of \[60m\] from the foot of a tower, the top of the tower and its image in the mirror subtend an angle of \[90{}^\circ \] at the eye. The height of the tower will be [CPMT 1984]

A.            \[30m\]                                  
B.            \[60m\]
C.            \[90m\]                                  
D.            \[120m\]
Answer» C.            \[90m\]                                  


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