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.

Answer 1

The Correct Option is B

An object positioned at the center of curvature before a convex lens will result in its image forming at the center of curvature on the opposite side. This image is characterized as real, inverted, and equal in size to the object.

Consequently, option (B), "At twice the focal length," is the accurate choice.