A screen is placed 90 cm from an object The image of the object on the screen is formed - Physics - Ray Optics And Optical Instruments

Question

A screen is placed 90 cm from an object The image of the object on
the screen is formed by a convex lens at two different locations
separated by 20 cm Determine the focal length of the lens Kindly
explain thoroughly

Sana Chaudhari · Answer

This is the answer to your question
<img src=
"https://s3mn%20mnimgs%20com/img/shared/content_ck_images/ck_5c711a182ac81%20jpeg">

A screen is placed 90 cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20 cm. Determine the focal length of the lens. Kindly explain thoroughly.