Archive
17th of March 2017
Physics
Q:

An image is formed by a convergent lens when the object is placed between lens and focus.Will the focal length be negative or positive.?Explain

Sayon Ghosh - CBSE - Class X

Friday, March 17, 2017 at 17:41:PM

A:

Hi,

On basis of New Cartesian Sign Convention, the focal length of a convex lens is considered to be positive and that of a concave lens is considered to be negative. 

Friday, March 17, 2017 at 18:04:PM