Question

The figure shows a girl viewing a rod placed in front of a plane mirror.When the cardboard is removed vertically upwards,which point will be seen first and last by her?

Answer 1

Answer: the first X and last is Z

Explanation:

Answer 2

After the vertical upward removal of cardboard, the point of the rod first seen by a girl is Z and last seen point is X.

• From given figure, it is clear that,
• The girl is looking at the image of the rod formed on the plane mirror lying horizontally on the surface.
• As it is clear that, the point which is nearer will be seen first.
• Therefore, the point of the rod first seen by the girl is Z
• and
• the point of the rod last seen by the girl is X.