Question

A person standing 1 m in front of a plane mirror approaches the mirror by 40 cm. The new distance between the person and his image in the plane mirror is ________.

• A. 60 cm
• B. 1.2 m
• C. 1.4 m
• D. 2.0 m

Answer 1

Answer: (B)

1.2 m

Plane mirror forms the image, behind it, at the same distance as that its distance from object placed infront of the mirror.
New distance between object and mirror $=60cm$
So, distance between image and mirror $=60cm$
Thus distance between image and object $=60+60=120cm=1.2m$