What is Lens? Types of lenses | the uses of convex and concave lenses

In is article we will understand that “what is lens, its types and uses”. There are mainly two types of lenses, 1) Convex lens and 2) Concave Lens.

What is Lens?

The lens is the transparent material, through light can be passed, and we can see from one side to another side.

 

Lens and Its Types and Uses

1)    Convex Lens

In the first part we discuss convex lens which are as you guessed converging lens. Convex lens is also constructed as the thin from the edges and thick from the center lens. It has optical centre, every lens has a centre which me referred as an optical centre.

When the light rays go through the convex lens, they are in straight line; after passing through the convex lens, they meet and get together at the same time.

 

Types of Convex Lens:

There are different kinds of convex lens:

1)      Double Convex lens

This is a convex lens from both sides: the edges are thinnest and middles will be thickest on both sides.

2)      Plano Convex lens

One side flat and the other side convex lens.

3)      Concavo- Convex lens

Biconvex Lens : A lens which is convex from one side and concave from other side.

 

The Uses of the Convex Lens:

Typical convex lens used in the optical instruments.

Telescopes are convex lenses in telescopes, if we want to focus on one thing the sky, Eg: the use of Moon We can see moon as enlarged because convex lens are used in telescopes.

Microscopes: We use convex lenses in microscopes also, as we want to see microscopic bodies, and make them visible by focusing on them to see them enlarged.

The lens of our eye is also convex lens.

 

Eye Defect treated by convex lenses:

Hyperopia or Farsighted:

The issue with our vision arises when light traverses the eye lens, resulting in the light beams being focused behind the retina. However, by employing a convex lens in front of the eye lens, the light beams initially pass through this external lens, which then attempts to direct the beams onto the retina.

 

 

2)    Concave Lens:

The second category of lens is the concave lens, which functions as a diverging lens. This lens is characterized by being thicker at the edges and thinner at the center. Additionally, it possesses an optical center. When light traverses the concave lens, it causes the light rays to diverge.

Types of Concave Lens:

There are different kinds of concave lens:

1)      Double Concave lens

This lens features a concave shape on both surfaces, resulting in thicker edges and a thinner center on either side.

2)      Plano Concave lens

This type of lens has a flat surface on one side and a concave curvature on the opposite side.

3)      Convexo- Concave lens

This lens is characterized by a convex surface on one side and a concave surface on the other. The convex side is thinner at the edges and thicker at the center.

 

The Uses of the Concave Lens:

Concave lenses have a variety of applications. They are utilized in binoculars to observe distant objects and are also employed in telescopes. Additionally, concave lenses are found in eyeglasses and flashlights, where they serve to diverge light.

Eye Defect treated by convex lenses:

Myopia or Nearsighted:

Myopia, commonly known as nearsightedness, is a vision impairment that can be corrected with concave lenses. This condition occurs when light entering the eye does not reach the retina effectively. By placing a concave lens in front of the eye's natural lens, the light rays are diverged, allowing the eye's lens to focus them properly onto the retina.

 

 

 

 

 

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