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What is converging and diverging lens ?Give explanation along with their types,please.
 A lens is a piece of transparent glass bound by two spherical surfaces.
There are two types of lenses :
Convex lens and Concave lens.

A convex lens is thick at the centre but thinner at the edges.
A convex lens is also known as a converging lens because it converges (brings to a point),a parallel beam of light rays passing through it.

A concave lens is thin in the middle but thicker at the edges.
A concave lens is also known as a diverging lens because it diverges a parallel beam of light rays.

There are three main types of convex lenses:
plano-convex lenses, double-convex lenses, and concavo-convex lenses. Concavo-convex lenses have another name - positive meniscus.


There are also three types of concave lenses.
Plano-concave lenses have a flat surface and one inward curving side. They are one of the many lenses found in cameras. Double-concave lenses have two inward curving edges and are used as reducing glasses to shrink the appearance of objects. Convexo-concave lenses (or negative meniscus) have one outward curving edge with one greater inward curving edge.


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