In a biprism experiment, when a convex lens is placed between the biprism and eyepiece at a distance of 30 cm from the slit, the virtual images of the slits are 7mm apart. If the distance between the slit eyepiece is 90 cm, find the linear magnification of the image.

Explanation

Linear magnification, `m=v/d = (D-|u|)/u = (90-30)/-30= 60/(-30) = -2`