Question

What is lens??
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Answer 1

Answer:

A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis. Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing. Devices that similarly focus or disperse waves and radiation other than visible light are also called lenses, such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses.

A biconvex lens

Lenses can be used to focus light

Lenses are used in various imaging devices like telescopes, binoculars and cameras. They are also used as visual aids in glasses to correct defects of vision such as myopia and hypermetropia.

Answer 2

Answer:

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$\mathtt\purple{DEFINITION \: OF \: LENS:-}$

It is a piece of glass or other hard clear material molded with one side flat and the other curved or both sides curved that forms an image by bringing together or spreading the light that passes through it.

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$\mathtt\purple{EXAMPLE:-}$

An example of lens is the clear pieces covering the eyes in eye glasses.