Uses of Convex Lens and Its Application
A convex lens, also known as a converging lens, is an important optical device that bends parallel rays of light to meet at a single point called the focus. Due to this property, it can form both real and virtual images depending on the position of the object. Convex lenses play a important role in many practical applications and optical instruments. The uses of convex lens include magnifying small objects in a magnifying glass, forming clear images in cameras, and enabling observation of distant or tiny objects in telescopes and microscopes. They are also widely used in eyeglasses to correct vision defects like hypermetropia.
Uses of Convex Lens
- Magnifying glass uses convex lenses .
- Eyeglasses use convex lenses.
- Camera uses a convex lens.
- Telescopes use convex lenses .
- Microscopes use convex lenses.
Convex Lens Used in Magnifying Glass
Magnifying glasses are most commonly used for seeing things larger. The light from the object comes through the convex lens of the magnifying glass .The light gets converged due to the convex lens and makes the image larger in our eyes.
Convex Lens Used in Eyeglasses
In hyperopia a human cannot be able to see things away from his sight. So, when the light rays come from an object and get through a lens then the image is formed in the retina and the farsightedness patient sees the object without any difficulty.
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Convex Lens Used in Camera
Image of convex camera
Convex lens is used in cameras not just for its focusing quality but also for its magnifying quality. Camera uses both the lenses convex and concave . There are convex lenses followed by a concave lens then a convex lens in a camera.
Convex Lens Used in Telescopes
Convex lens used in Microscope:
There are two convex lenses in a microscope. The light rays from the object come through the objective lens then through the eyepiece .Due to double refraction the object becomes larger than the actual size of the object , So, the small objects also get magnified .
Convex Lens: Essential Concepts and Formulas
1. Definition: A convex lens is a converging lens which brings parallel rays of light to a focus.
2. Important Terms
Optical Centre (O): A point through which a ray passes without deviation.
Principal Axis: Straight line passing through the optical centre.
Focus (F): Point where parallel rays converge.
Focal Length (f): Distance between optical centre and focus.
3. Lens Formula : $\frac{1}{f}=\frac{1}{v}+\frac{1}{u}$
4. Magnification: $m=\frac{v}{u}=\frac{h_i}{h_o}$
5. Power of Lens: $P=\frac{1}{f} \quad \text { (f in meters) }$
Unit: Dioptre (D)
Convex lens has positive power
6. Image Formation
| Object Position | Image Position | Nature |
| At ∞ | At F | real, point |
| Beyond 2F | Between F and 2F | real, inverted |
| At 2F | At 2F | same size |
| Between F and 2F | Beyond 2F | real, magnified |
| At F | At ∞ | highly enlarged |
| Inside F | Same side of lens | virtual, erect |
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Frequently Asked Questions (FAQs)
The other name of convex lens is converging lens.
A convex lens that makes an object appear bigger than the actual is called a magnifying glass.
They are used in imaging applications.
Spectacles use both concave and convex lenses.
Convex lens
Convex lens
The lens which converges the rays of light are known as convex lenses.
If the radius of curvature equals that type of convex lens is known as equi-convex lens.
Bi-convex lens , plano-convex lens and concave-convex lens are a few types of convex lens.
When light rays emerge from the convex lens the rays converge on the focus point.
