Question

What is the lens in science

Answer 1

A lens is a transmissive optical device which 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, usually arranged along a common axis

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Answer 2

Lens:

• A lens is a transmissive optical devices which focuses or disperses a light beam by means of refractive.
• A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses , usually arranged along a common axis.
• Lens are made from materials such as glass or plastics, and are ground and polished or molded to a desired shape.
• A lens can focus the light of to form a 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, explosive lenses.

Types of lenses:

• Aspheric lens
• Cylindrical lens
• Fresnal lens
• Concave and convex lens.

Concave lens:

• A concave lens is a lens that possesses at least one surface that curve inwards. It is diverging lens , means that it spreads out light rays that been refracted through it.
• A concave lens is thinner at its centre of curvature than at its edges, and is used to correct short-sightedness (myopia).

Convex lens:

• A convex lens is a lens that converges rays of light that convey parallel to its principal axis. It is also called as a converging lens.
• A converging lens is a lens that are travelling parallel to its principal axis.

Uses of lens:

• Used in a magnifying glass,
• Prosthetics for the correction of visual impairments,
• Attenuate light,
• In imaging system,
• Radar systems.