Question
Science Question on Light - Reflection and Refraction
At what distance from a convex lens should an object be placed to get an image of the same size as that of the object on a screen ?
A
Beyond twice the focal length of the lens.
B
At the principal focus of the lens.
C
At twice the focal length of the lens.
D
Between the optical centre of the lens and its principal focus.
Answer
At twice the focal length of the lens.
Explanation
Solution
When an object is placed at twice the focal length (2F) of a convex lens, the image formed is real, inverted, and of the same size as the object.