Question

A object is placed at distance 40cm in front of convex lens of focal length 20cm the image distance is

Answer 1

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Answer 2

Answer: The image distance is 40 cm.

Explanation:

The lens formula is as follows;

$\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$

Here, u is the object distance, v is the image distance and f is the focal length.

It is given in the problem that A object is placed at distance 40cm in front of convex lens of focal length 20cm.

Put u= -40 cm and f= 20 cm.

$\frac{1}{v}-\frac{1}{-40}=\frac{1}{20}$

$\frac{1}{v}=40 cm$

Therefore, the image distance is 40 cm.