Factors of Differentiation Between Concave and Convex Lens

Since concave and convex lenses reflect light rays differently, a concave lens distributes the beam randomly, while the convex lens spreads the shaft straight. As a result, both concave and convex lenses are advantageous for various applications and provide several advantages.

Continue reading to better understand the difference between concave and convex lens by reading the post below.

Concave Lens

A concave lens is a kind of lens with a curved surface used to magnify physics things. From the centre, the surface is curved inward. A diverging lens, sometimes referred to as a concave lens, splits the light beam into many directions.

Short-sighted individuals often choose concave lenses, which are small lenses with a convex form, to correct their vision.

Bi-concave and Plano-concave lenses are the two most frequent types of concave lenses, with biconcave lenses being the most widespread. Concave lenses are found in various technologies, such as eyeglasses, cameras, lasers, and spotlights.

Due to the concave lens, the image of the object is decreased. Diverging a concave lens produces virtual pictures, which is why it is referred to in this context as a diverging lens.

Convex lens

Convex lenses, as the name implies, have two convex/spherical surfaces on their surfaces. Biconvex lenses are those that have had their rotational axis turned outward. There are just two parallel rays erupting from the convex lens, and they are pretty close together. Unlike curved surfaces, it is entirely covered rather than folded inwards.

Convex lenses are used in many different applications, such as eyeglasses, magnifying glasses, and microscopes. As shown below, the formula for the convex lens may be found by subtracting one from one and multiplying it by one.

This formula takes into account the focal length (f), the distance between the lens and the subject (v), and the distance between the lens and the subject (u).

Plano-convex, double-convex, and concave-convex lenses are the three types of convex lenses. The plano-convex lens is the most common kind of lens.

Factors Differentiating Concave And Convex Lenses

In a variety of ways, convex and concave lenses are opposed. Read the following differences between concave and convex lens below:

1 When a concave lens is used, the light beam is spread out across a vast area and classified as such. When seen via a convex lens, the light beam extends out in a straight line.
2 A concave lens deviates from the focal plane. In certain areas, convex lenses refer to as converging lenses.
3 A concave lens has a single concave surface. The surface has a little inward curve. In contrast, a convex lens has two spherical surfaces, one of which is curved outwards and the other flat.
4 It conveys a distinct point of view. It features a virtual focus on the screen.
5 Magnification produced by a concave mirror may be more equal or less than through a flat mirror. A convex mirror amplifies items by less than a factor of one.
6 The edges are thicker than the centre in a concave lens, and the centre is narrower than the boundaries to achieve the desired effect. Compared to other lenses, convex lenses get distinguished by their thin sides and thick centre.
7 Myopia, also known as near-sightedness, is treated with concave lenses, which are curved lenses. Convex lenses treats hypermetropia (farsightedness) (near-sightedness).
8 A concave mirror has a focal length that is less than one and is used to magnify objects. The focal length of a convex mirror is in the direction of the positive arrow.
9 Concave lenses produce small, virtually indistinct, and vertically oriented images all at the same time. According to the focal length of the lens, a convex lens can produce images that are either small or large, depending on the situation. Realistic and reversed images are displayed on the computer screen for your viewing pleasure.
10 Concave lenses can be used in a variety of different situations, depending on the situation. When it comes to optical equipment, convex lenses are used in magnifying glasses, microscopes and other optical instruments.

Types of Concave Lenses

  • Biconcave Lens: A biconcave lens is a surface that has concave lenses on both sides. According to its definition, the term “diverging lens” refers to a lens in which light is reflected in various directions.
  • Plano-Concave Lens: A lens is considered plano-concave when one side is concave and flat. These lenses are used for a variety of applications, including beam extension and light projection.
  • Negative Meniscus: A negative meniscus is a convex and concave lens.

Types of Convex Lenses

  • Bi-convex Lens: A biconvex lens has convex surfaces on both sides. Because it is constructed of biconvex lenses, it is referred to as a converging lens.
  • Plano-Convex Lens: Two plane surfaces and one convex surface comprise a plano-convex lens. To focus and gather light beams, plano-convex lenses are utilised, which are then parallel converged to provide the desired output.

As a consequence, several concave and convex lens designs are available. The following examples demonstrate how these lenses may be used in a variety of circumstances.

Uses of Concave Lens

  • Types of Glasses: Concave lenses are most often used by those who have myopia (short-sightedness) or hyperopia (farsightedness). A little image is formed on the retina as a result of the dispersion of the light beams.
  • Laser lights: In a wide variety of laser-emitting devices, including medical equipment, scanners, and CD players, concave lenses are utilised. Because the beams are spread in a wide range of directions, they can achieve their desired results.
  • Cameras and Cam-coders: When photographing with a digital camera, concave lenses are used. Both convex and concave lenses are often found in cameras, and both contribute to the capacity to record sharp images of our surroundings.
  • Flashlights: In flashlights, concave lenses are used to amplify or enlarge the light output.

Uses of Convex Lens

  • Glasses: Convex lenses treats hypermetropia, sometimes referred to as long-sightedness. When the eye’s lens cannot concentrate the light, it is possible to view the picture behind the retina. This is one of the reasons convex lenses get employed in the correction of vision issues in glasses.
  • Microscope lenses: Microscopes make use of convex lenses to create magnified pictures of tiny things.


In conclusion, below are the specifics on concave and convex lenses, along with a brief explanation of the differences between concave and convex lens. Keep these notes close at hand if you want to achieve success in future competitive tests.

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