Visibility of mirror images requires unobstructed line of sight to virtual images

Steps:

• Locate virtual images of P, Q, R behind the mirror at equal distances from the mirror surface.
• Draw straight lines from the student's eye to each virtual image and check where they intersect the mirror.
• For P, the line intersects the mirror, allowing visibility.
• For Q and R, the lines miss the mirror entirely, blocking visibility.

Why B is correct:

• Option B (✓ x x) matches the setup where only P's image is visible, as the eye's line of sight reaches P's virtual image via the mirror but bypasses it for Q and R, per the law of reflection in plane mirrors.

Why the others are wrong:

• A assumes all images visible, but Q and R's lines of sight do not intersect the mirror.
• C and D lack sufficient options or contradict the visibility for P only.

Final answer: B