Question

plzzzz give me an answer quickly !!!!
A bag contains lenses with focal lengths 10cm, 20cm and 25cm which are not marked with there focal lengths. Describe a simple activity to identify the three types of lenses?

Answer 1

Answer:

-14.3cm

Explanation:

Since, v is negative. So image formed is virtual.

Hence, virtual image is formed at a distance of 14.3 cm in front of the lens.