Convex lens

  Convex lens

The lens is a refractive medium. Lens has two surfaces. Either both surfaces are spherical or one surface is spherical and another plane surface.

The convex lens has a thicker mid-portion and thinner edges. Each Convex lens has two spherical surfaces.

Each spherical surfaces are part of a different spheric. The point at the center of the sphere from which the mirror segment is taken is known as the center of curvature.

The principal axis is the straight line that passes through the center of curvature. 

If also called a converging lens. A parallel beam of light enters into a convex lens and after refraction rays converge into a point. This point is called the focus point. That’s why a convex lens is often referred to as a converging lens, since it brings light rays together at a point.

When light rays are not parallel to the principal axis, they bend after refraction and meet at a point away from the principal axis.

Why does a convex lens bring light rays together at a single point?

A lens is made of a numerical number of prisms and when rays of light enter into a prism they after refraction always bend towards the base. Therefore they converge at a point.

Optical center: Optical center is the central point of lyes on the principal axis within the lens. When a ray of light passes through the optical center of a thin convex lens, it continues in the same direction without bending. A convex lens features a single curved surface.

However, in the case of a thick convex lens, a light ray passing through the optical center emerges nearly parallel to the direction of the incident ray.