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Convex Lens

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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

Object at F1 and O

2. Object is placed at 2F1

Object at 2F1
3. Object is placed between F1 and 2F1

Object at F1 and 2F1

4. Object is placed at F1

Object at F11

5. Object is placed beyond 2F1

Object Beyond 2F1

6. Object is placed at infinity

Object 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