# Introduction Of Lens

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A lens  is a piece of refracting meduim bounded one and two spherical surface Types Of Lens

There are two Types of Lens

1- Convex or Converting Lens

2- Concave Or Diverging Lens 1- Convex Lens

lens in which at the center and at the edges are called the Convex Lens  in which the parallel rays of the light

2- Concave Lens:-

In which is thinner at the center and edges is called the Concave lens

Kinds Of Convex Lens

1-      Double Convex  Lens

2-      Plano Convex Lens

3-      Concave Convex Lens Double  Convex Lens:-

Double convex Lens are the both sarfece is the Convex is called the convex

Plano Covex Lens:-

Surface of one plane is and the other tpyes of convex is called the Plano Convex lens

Convex concave lens:-

One surface is type of concave and the othe type of surface is that the convex lens is called the convex and concave lens Kinds of concave Lens

1-      Double Concave Lens

2-      Plano Lens

3-      Convex Lens

1-      Principal Axis

Line that the passes through the center of the two spherical in the lens of is called the principal of axis of the lens

2-      Aperture:-

Diameter of MM of the lens is called the Aperture Of the Lens

3-      Center of Curvature:-

The center of the sphere of the which is one spherical surface  of the lens part that is called the Center of Curvature The Radius of the Curvature  of the sphere of in which of the lens is a part is called the radius of the curvature of the lens

5-      Optical Center:-

The centeral point of the lens a ray of the light passing  of the point do not device is called the optical center of the lens