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Types of Lenses in Physics

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Last updated date: 24th Jul 2024
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There are two sides to a lens, one of which is curved, and the other is flat. Circular shapes are most common. Bending light is done with lenses.

A lens distorts the image of an object, making it appear larger or smaller than it really is. Among other things, lenses bend light in useful ways in instruments such as telescopes, binoculars, microscopes, cameras, and eyeglasses.

Lenses are transparent pieces of glass or plastic with at least one curved surface that can be used to control light (some are only mirrors). You should not be confused by its name since it derives from Latin. A convex lens is the most common type of lens, and resembles a lentil, so this may have something to do with it.

What is the Process of Making Lenses?

As light rays pass through a lens, they bend, changing their direction as they do so. Thus, objects seen through a lens appear bigger or smaller than they really are because the rays seem to come from closer or farther away.

An Overview of Lens Types

Convex lenses (or converging lenses) and concave lenses (or diverging lenses) are the two most common types of lenses.

1. Convex Lenses:

It has the classic lentil shape as it bulges outwards in the centre of the lens (sometimes called a positive lens). The focal point of a convex lens is determined by bending rays of light passing through the lens inward, resulting in the rays meeting quickly in the focal spot. CONVEX or POSITIVE lenses focus light and can form images.

Convex Lens

Convex Lens

2. Concave Lenses

A hollow lens is exactly the contrary with the external shells curving inward, so it makes resemblant light shafts curve outward or diverge. That is why hollow lenses are occasionally called diverging lenses. (One easy way to flashback the difference between concave and convex lenses is to suppose concave lenses caving inwards.) CONCAVE or NEGATIVE lenses will DIVERGE (spread out) light shafts

Concave Lens

Concave Lens

3. Emulsion Lenses

It's possible to make lenses that bear in more complex ways by combining convex and concave lenses. A lens that uses two or further simpler lenses in this way is called an emulsion lens.

Difference Between Concave and Convex Lenses

A hollow lens angles inward. The middle of it is thinner than the edges, so it has a thicker middle. When light passes through a hollow lens, the light shafts bend so that they spread piecemeal. hollow lenses make objects look lower than they really are.

A convex lens angles outward.

How are Lenses Made?

Until plastics came common in the 20th century, nearly all lenses were made by grinding solid pieces of glass into different shapes. Convex lenses were made by using a concave-shaped grinding tool( and vice-versa), and also the roughly shaped lens was polished to make its final shape. 

The Lens of the Eye

The eye contains a lens that bends light shafts so that they meet exactly on a part of the eye known as the retina. However, the result is hypermetropia or vision, If the lens doesn't bend light shafts duly. Hypermetropia makes away effects look vague. vision makes close-up effects look vague. The lenses of both types of eyeglasses bend light shafts so that they meet on the retina.

Simple or Complex Lenses?

Simple lenses can not form veritably sharp images, so lens controversy or optic masterminds figure out how to combine the simple types to make complex lenses that work more. We use special computer programs to help us do this because it can make BILLIONS and BILLIONS of computations.

These biases use these types of lenses. Can you guess what they are?

Mobile Lens

Mobile Lens

Camera Lens

Camera Lens

Magnifying Glass: A Simple Optic Device

Lens with Virtual Image

Lens with Virtual Image

This illustration shows how a magnifying glass bends light shafts to make effects look bigger than they are. numerous optic biases use the same introductory idea of bending the light to wisecrack your eye and brain so light LOOKS like it came from a different (generally larger or near) object.


In summary, we can say that convex lenses can form images for various locations of objects and concave lenses can create images for different points of view.

Furthermore, we can justify the use of particular lenses in such instruments as telescopes, microscopes, etc., based on the images they form. Various uses of lenses are described in the article like convex lenses used in a microscope, magnifying glasses, camera, correction of hypermetropia, etc. 

FAQs on Types of Lenses in Physics

1. Why do you need lenses?

What kind of glasses do you wear? Do you know anyone who wears glasses? Depending on your experience, you might already know that everyone's eyeglasses are unique. People's glasses may differ in their ability to focus things close up or far away depending on their preferences. Glass lenses, such as those on eyeglasses, are specially shaped to refract, or direct, light rays in a way that makes them easier to see.

2. How does optics work?

Light is a physical force that interacts with matter and permits devices to be made using it in order to study its properties and behaviour. Optics is a study of optical properties which explain the behaviour of light in infrared, visible, and ultraviolet wavelengths. Throughout the cable, a beam of light travels down its core. Cables and glass structures have a core in the middle. Wrapping the core with glass creates the cladding. Light signals are kept inside the core by the cladding.

3. How can lenses be used?

There are lots of imaging tools that use lenses, such as cameras, binoculars, and telescopes. As well as correcting vision defects like myopia and hypermetropia, they are also extensively used to correct other vision defects.

A lens works by bending light rays so they change direction as they pass through.That results in objects appearing larger or smaller than they actually are by causing the rays to appear to come from a different point.