Question

Define Lens
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Answer 1

Answer:

A lens is a transmissive optical device which focuses or disperses a light beam by means of refraction.

Answer 2

Answer:

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A piece of glass or other transparent material with curved sides for concentrating or dispersing light rays, used singly (as in a magnifying glass) or with other lenses (as in a telescope).

Lenses are basically magnifying glasses with curved sides. A lens is a piece of transparent glass which concentrates or disperses light rays when passes through them by refraction. Magnification of a lens is the relation between the size of the image formed and the size of the object.