Question

Where should an object be placed in front of a convex lens to get a real image of the
size of the object?
(a) At the principal focus of the lens
(b) At twice the focal length
(c) At infinity
(d) Between the optical centre of the lens and its principal focus.

NCERT Class X
Science - Science

Chapter_Light – Reflection and
Refraction

Answer 1

(b) At twice the focal length.

Answer 2

option b twice the focal length