Question

Explain the image formation due to thin lens and derive -1/u + 1/v =(n₂-n₁/n₁)(1/R₁ - 1/R₂) relation.

Answer 1

The image formed by thin lenses is a real image, meaning that it can be projected.

That is, light rays from one point on the object actually cross at the location of the image and can be projected onto a screen, a piece of film, or the retina of an eye, for example.

It how such an image would be projected onto film by a camera lens.

This image also shows how a real image is projected onto the retina by the lens of an eye.