A lens is an optically transparent medium bounded by two spherical refracting surfaces or one plane and one spherical surface.
Lens is basically classified into two types.
They are: (i) Convex Lens (ii) Concave Lens

**LENSES**

A lens is an optically
transparent medium bounded by two spherical refracting surfaces or one plane
and one spherical surface.

Lens is basically
classified into two types.

They are: (i) Convex
Lens (ii) Concave Lens

**(i) Convex or bi-convex
lens: **It
is a lens** **bounded by two spherical surfaces such that it is thicker at
the centre than at the edges. A beam of light passing through it, is converged
to a point. So, a convex lens is also called as converging lens.

**(ii)â€‰Concave or
bi-concave Lens: **It is a lens** **bounded by two spherical surfaces such that it
is thinner at the centre than at the edges. A parallel beam of light passing
through it, is diverged or spread out. So, a concave lens is also called as
diverging lens.

**Plano -convex lens: **If one of the faces of a**
**bi-convex lens is plane, it is known as a plano-convex lens.

**Plano-concave lens: **If one of the faces** **of
a bi-concave lens is plane, it is known as a plano-concave lens.

All these lenses are
shown in Figure 2.2 given below:

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10th Science : Chapter 2 : Optics : Lenses |

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