Physics
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Uses of Concave Lens

Concave lens are used in spectacles, headlights, peepholes, lasers and many more. Understand them in detail below.

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Posted by Mahak Jain, 20/10/2021
Uses of Concave Lens

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A lens is a transparent optic device that converges or diverges light rays by means of refraction. A concave lens have both the sides bulging inwards. Thus, it is a converging lens. Whereas, a convex lens have both the sides bulging outwards. Thus, it is diverging lens. A concave lens is also called as a negative lens. There are numerous uses of the concave lens, like in telescopes, cameras, lasers, glasses, binoculars, etc.

Use of Concave Lens in Spectacles

Concave lens can correct myopia/short sightedness. The eyeball of a person who has myopia is too long, and the images of faraway objects fall short of the retina. Therefore, concave lenses makes the object appear near that it actually is. This enables the person to see far away objects more clearly.

This is most common use of lenses now a days.

Use of Concave Lens Spectacles

Uses of Concave Lens in Car Headlights

Concave lens being a divergence lens find its use in headlights of vehicles. This lens diverges the light over wider angle that help in a clear view of the far vehicles at night.

Uses of Concave Lens in Car Headlights

Concave Lens in Flashlights

For the same reason in above point, we use concave lens in flashlights. Hence, light beans gets magnified. This increases the radius of the light beam and thus provides a wider view angle.

Concave Lens Flashlights

Use of Concave Lenses in Peepholes

We all have a small lens fixed in a hole in our doors to view outside. These are the peepholes to peep who is outside the door. The concave lens provides a panoramic view of scene outside the door helping us to see wider angle.

Use of Concave Lenses in Peepholes

Use in Lasers

Many modern devices like printers, scanners, CD and DVD players use laser beams. In this we want a sharp but magnified beam. Laser produces a sharp beam and then concave lens magnifies beam. Thus, we can cover a specific area with high intensity.

Use in Lasers

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