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Concave Lens

Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out (they diverge). A concave lens is a diverging lens. When parallel rays of light pass through a concave lens the refracted rays diverge.

Concave always have negative focal length, negative object diatance.

Image formed by concave lens is always diminished, virtual and erect

Formula of lens

1/f = 1/v - 1/u

Where f is focal length

u is object distance

v image distance

Uses of conacave lens

Concave lenses have several uses, including in eyeglasses and contacts, flashlights, peepholes, binoculars, telescopes, and in photography.