A needle placed `45 cm` from a lens forms an image on the screen placed `90` cm on the
Channel: Doubtnut
Date: 2020-07-26

A needle placed `45 cm` from a lens forms an image on the screen placed `90` cm on the other side of the lens. Identify the type of the lens and determine its focal length. What is the size of the image if the size of needle is `5.0 cm` ?