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# Convex Lens

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 Sub Topics The main use of lenses are to change the path of light rays before they enter our eyes. It is made up of transparent material like glass and has one or two curved surfaces which can refract light. The thickness and curvature of a lens affect the way it refracts light. The main categories among lens are concave and convex lenses. The details regarding the convex lens are described in the following section.

## Convex Lens Definition

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Convex lens can be defined as the lens which the center part is bulged outwards and the thickness is reduced along the edges. When a light ray is incident on the surface of a convex lens, it gets refracted and emerges out at different directions. Convex lens can converge the parallel rays to a point (focal point) since it is known as converging lens.

## Convex Lens Ray Diagram

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A convex can form either real or virtual images. This image formation is depends on the position of the object in front of the convex lens. Each position of the object and corresponding image formation is illustrated in the given figures. And the conclusion is summarized in the table.

1. Object is placed between F1 and O

2. Object is placed at 2F1

3. Object is placed between F1 and 2F1

4. Object is placed at F1

5. Object is placed beyond 2F1

6. Object is placed at infinity

 Position of the object Position of the image Nature of the image Object is placed between F1 and O Same side of the lens Virtual and erect- magnified Object is placed at 2F1 At 2F2 Real and inverted- same size Object is placed between F1 and 2F1 Beyond 2F2 Real and inverted- magnified Object is placed at F1 At infinity Real and inverted- magnified Object is placed beyond 2F1 Between F2 and 2F2 Real and inverted- diminished Object is placed at infinity At F2 Real and inverted- diminished

## Convex Lens Examples

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Some of the examples of convex lens are given below :
• Slides and movie projector
• In cameras
• Lighthouses
• Contact lenses
• Eyeball