Question

A magnifying glass of focal length $5\,cm$ is used to view an object by a person whose smallest distance of distinct vision is $25\,cm$ . If he holds the glass close to eye, the magnification is

• A. 5
• B. 6
• C. 2.5
• D. 3

Answer 1

Answer: (B)

6

Answer 2

$m=1+\frac{D}{f}$
Given, $f=5\, cm,\, D=25\, cm$
$\therefore m=1+\frac{25}{5}=6$