Focal Length Of Lens

A lens haivng focal length and aperture of diameter d forms an image of intensity I . Aperture of diameter d/2 in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively.

Finding Focal Length Of A Convex Lens

The focal length of a lens depends on

Define focal length of a lens and calculate focal length of the lens having radius of curvature 30 cm.

Focal length of convex lens will miximum for

The focal length of a lens depends upon

Focal length of eye lens is changed by