Question

Correct statement about motion of a point object and its image formed by a plane mirror is
(1) While moving in direction perpendicular to the mirror object and image may have same velocity
(2) Speed of object and image will always be same
(3) With respect to mirror, object and image are always travelling in opposite direction
(4) None of these​

Answer 1

The correct statements about motion of a point object and its image formed by a plane mirror are as follows:

• The velocity of the image with respect to the object is given by,
• = v - (-v) = 2v
• Therefore, while moving in the direction perpendicular to the mirror object and image may have different velocity. (1)
• In the plane mirror, the distances of an object from mirror and distance of the image from the mirror are same always and as a result, their rate of change with respect to time is also same and hence speeds are same.
• Therefore, (2) Speed of object and image will always be the same
• Because of reflection, with respect to the mirror, object and image are always travelling in the opposite direction. (3)