Q. An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be
A) 30 cm towards the mirror
B) 36 cm away from the mirror
C) 30 cm away from the mirror
D) 36 cm towards the mirror
Explanation
[Solution] u = -40: v = -24 cm. u = -20: v = -60 cm. The image moves 36 cm away from the mirror. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.