Question

A point source of light is placed at a distance of $2f$ from a converging lens of focal length $f$ The intensity on the other side of the lens is maximum at a distance ________.

• A. $f$
• B. Between $f$ and $2f$
• C. $2f$
• D. More than $2f$

Answer 1

The correct option is C $2f$

When object is at 2f of a converging lens than image of high intensity will be observed at 2f as in diagram.