Question

A converging lens of focal length 6.25 cm is used as a magnifying glass. If near point of the observer is 25 cm from the eye and the lens is held close to the eye, then the magnification is :

• A. 4
• B. 5
• C. 8
• D. 10

Answer 1

Answer: (B)

5

As magnification $m=1+\frac{D}{f}$
$⟹$ $m=1+\frac{25}{6.25}$
$⟹$ $m=5$