2015 · Q24
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
General KnowledgePhysics
- A60 cm
- B1.2 m
- C1.4 m
- D2.0 m
Explanation
After approaching the mirror by 40 cm, the person stands 60 cm in front of it. In a plane mirror the image forms as far behind the mirror as the object is in front, so the distance between the person and his image is 60 + 60 = 120 cm, i.e. 1.2 m — option B.