Question

A thin lens produces an upright image of the same size as the object. Then from the optical centre of the lens, the distance of the object is :

• A. Zero
• B. $4f$
• C. $2f$
• D. $\frac{f}{2}$

Answer 1

Answer: (A)

Zero

The thin lens is produced an upright image of the same size as the object, so the magnification is $m=1$

Lets consider

$f=$ focal length

$v=$ Distance of image from the optical center

$u=$ distance of object from the optical center

Magnification, $m=\frac{f}{f+u}=1$

$f=f+u$

$u=0$

The correct option is A.