question_answer

A man of 180 cm height stands in front of a plane mirror. His eyes are at a height of 170 cm from floor. Then the minimum length of a plane mirror required for him to see his fall image is (a) 90 cm             (b) 180 cm (c) 45cm                               (d) 360 cm

Answer:

Length of the plane mirror required to see the image of an object of height H is H/2 which is irrespective of position of eye.