Ten Standard >> 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 center of the sphere is called 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. For this reason, a convex lens is called a converging lens. 

If the rays of light are not parallel to the principal axis then after refraction they converge at a point outside the principal axis.

Why is a convex lens converging light as a 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. If a ray of light passes through the optical center of a thin convex lens it travels without any deviation for refraction. A convex lens has only one convex lens. 

But for a thick convex lens when a ray of light passes through the optical center the ray of light converted into the parallel ray of the incident ray.