Introduction ...
Rainbows, mirrors, and holograms are manifestations of the properties of
light. Optics, the study of light, is a diverse field of science concerned with how light
is produced and transmitted and how it interacts with matter. Here, you will understand
more about the various types of lenses and their uses. Next, you will discover why we
fondly refer the eye to as the 'miracle lens'. Have fun !
Lenses - A brief explanation
A lens is a device for forming an image
of an object by refraction or bending of light.
In its simplest form it is basically a disk made of a
transparent substance, usually glass or plastic, with its two surfaces curved or with one
surface plane and the other curved.
Generally each curved surface(convex) if it curves outward , and concave if curves inward
of a lens and it is made such as it is a portion of a spherical surface. The center of the
sphere is called the center of curvature(C) of the surface.
All rays of light passing through a lens are refracted other than those that passes
directly through a point called the optical centre. We will probe into the parts of a lens
later.
There are basically 2 types of lenses : Convex and Concave
lenses. Each of them have their own functions.
Now that you have a rough idea of lenses, we will move on
to the parts of a lens...
