A tall person 'A' and a short person 'B' stood before a plane mirror. 'A' stands 1.25 metres behind 'B' . If the distance between 'B' and the plane mirror is 50 cm , then the distance between 'A' and his image in the mirror is _______ .

Options

A. 4 cm
B. 3.5 cm
C. 4.5 cm
D. 3.75 cm

Answer

B

Explanation

Distance between the plane mirror and B=50 cm =0.5 m
Distance between A and B =1.25 m .
Therefore, distance between the plane mirror and A=1.25 m + 0.5 m
=1.75 m
Therefore, distance between A and his image in the mirror in the mirror `=2xx1.75 `m
`=3.5 m`
Hence, the correct option is (b).