A 50 cm tall object is at a very large distance from a diverging lens. A virtual, erect
Channel: Doubtnut
Date: 2020-01-26

A 50 cm tall object is at a very large distance from a diverging lens. A virtual, erect and diminished image of the object is formed at a distance of 20 cm in front of the lens. How much is the focal length of the lens?