Question

Two plane mirror ${AM}_1$ and ${BM}_2$ lying along x and y-axis, as shown in the figure. Three point object $P_1,P_2$ and $P_3$ lies as shown in the figure. Then

• A. Number of images of point object $P_1$ formed by two plane mirror is two.
• B. Number of images of point object $P_2$ formed by two plane mirror is four.
• C. Number of images of point object $P_3$ formed by two plane mirror is three.
• D. Number of images formed of point object $P_3$ by two plane mirror is one.
• E. None of these

Answer 1

The correct option is A Number of images of point object $P_1$ formed by two plane mirror is two.

• Rays of $P_1$ can reach $A{M}_1$ and $B{M}_2$ and form images.But there is no rays which reflects from one mirror to another.
• Therefore only 2 images are formed.
• $P_2$ can produce images on $A{M}_1$ and $B{M}_2$ separately.Also there is a scope of rays of $P_2$ got reflected to $A{M}_1$ from $B{M}_2$ and cause image formation.
• Total number of images will be 3.
• No rays of $P_3$ can reach $B{M}_2$ rays of $P_3$ reach $A{M}_1$ and produce one image.