A thin equiconvex lens has focal length 10 cm and refractive index 1.5 . One of its faces is now
Channel: Doubtnut
Date: 2020-01-26

A thin equiconvex lens has focal length 10 cm and refractive index 1.5 . One of its faces is now silvered and for an object placed at a distance u in front of it, the image coincides with the object. The value of u is