|
|
 |
Plano
Convex |
| |
 |
|
|
These Lenses have one Convex surface and have a
positive focal length. They converge the incident light. They can be
used as simple magnifiers and also in a variety of
applications for collecting and
focussing light. |
| |
|
|
|
Bio Convex Lenses |
| |
 |
|
|
These lenses have two convex surfaces. They can
be either symmetrical (both surfaces having the same radius) or
asymmetrical
(both surfaces having different radii). They have a positive focal
length and converge light. |
| |
|
|
Plano Concave Lenses |
| |
 |
|
|
The name itself indicates that these lenses
have one plane i.e. flat and one inward curved surface. They have a
negative focal length & diverge light. They form only
virtual images which are seen through the
lens. They are useful to expand light beams or to increase focal length
in an optical system. |
| |
|
|
Bio Concave Lenses |
| |
 |
|
|
Bio Concave Lenses have two inward curved
surfaces. They have negative focal length and
are used similarly. They can either be symmetrical or asymmetrical. |
| |
|
|
Meniscus Lenses |
| |
 |
|
|
A Meniscus lens has one concave and convex
surface. It can either have a positive or a negative focal length
depending on the radii of the two surfaces. This lens can be used in
combination with other lenses to increase or decrease the focal length
of the system. |
| |
|
|
Ball Lenses |
| |
| |
|
|
These are polished glass balls and can be made
with high diameter tolerances. Useful in fiber optics. |
| |
|
| |
|
