Planoconvex lens
- Updated:
- By: Kevin van Mierlo
Contents
What is a Planoconvex lens?
Definition
Every LED lamp has its own lens. The lens determines the light’s beam angle and the extent to which the light is dispersed. An example of such lens is the plano-convex lens, also known as lens p.c. lens. This is a flat-convex optical lens with a positive focal length. ‘Plano’ refers to the flat side and ‘convex’ to the curved side. When the light source is located at the focal point, the emitted light beams will exit the lens in parallel. Because they exit the lens in parallel, a fairly narrow beam is created which can be used over long distances. A plano-convex lens is therefore ideal for a driving light that can provide you with clear light even from a distance.
Difference between convex and concave lens
A planoconvex lens contains a convex lens, but what is the difference between a convex and concave lens? A convex lens allows the light beams to come together and a concave lens allows the light beams to separate. There are three different convex lenses: biconvex, positive meniscus and a planoconvex lens. There are also three different concave lenses: negative meniscus, planoconcave and biconcave lens.
What different light beams are there?
A light beam consists of all the light beams produced by a light source. There are three different types of light beams: parallel, divergent and convergent. A parallel light beam is one in which all light beams shine in parallel in the same direction. A driving light is a good example of this. A divergent light beam is one in which the light beams move apart. A good example of this is the flood beam used in the agricultural sector. When it is dark, a farmer still needs to be able to see his land clearly. The flood beam ensures that a large area is illuminated. Finally, there is the convergent light beam. This is a light beam in which the light beams move towards one another. A good example of this is a magnifying glass.
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Author
Kevin van Mierlo
Lighting expert at TRALERT® - Kevin tests lighting and finds out everything about legislation. He can tell you all about it.
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