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What is a Lens?

A lens is a transparent curved device that is used to refract light.

A lens is usually made from glass. There are two
different shapes for lenses. They are called convex and concave.

Convex and Concave Lens

What is a Convex Lens?

A convex lens is thicker in the middle and thinner at the edges.
A convex lens is also called a converging lens.
A convex lens will focus light and make an image.
The image formed by a convex lens is real and inverted
(and can be bigger or smaller than the object)
unless it is being used as a magnifying glass when
the image will be virtual, upright and bigger than the object.

What is a Concave Lens?

A concave lens is thinner in the middle and thicker at the edges.
A concave lens is also called a diverging lens.
A concave lens will disperse light and make an image
that is always virtual, upright and smaller than the object.

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