Plano-Concave Lenses
Plano-Concave Lenses
The Plano-Concave Lens have one flat surface and one concave surface. They have a negative focal length and are used to diverge incoming light, or to increase focal length in an existing optical system. They can be used in beam expanders and projection systems.
CLZ Optical Co., Ltd. specialize in manufacturing optical components from customer supplied designs, including a wide variety of Plano Concave Lenses. We can provide Featuring surface accuracy to less than 0.2 fringe measured at 633nm and finishes to 20-10 scratch-dig per MIL-PRF 13830, the material are fabricated from quartz, optical glass, silicon, etc. and the sizes up to 200mm diameter.
Application of Plano concave lenses
1. Spectacles
Concave lenses are widely used as corrective glasses for myopia or nearsightedness. People who are nearsighted cannot see distant objects. This is because the increased distance between the lens of the eye and the retina in myopia causes light rays to collect before the surface of the retina, where no image is formed, and thus the patient sees distant objects as blurred images. This can be corrected by placing a concave lens in front of the myopic eye, which diffuses the light rays and increases the focal length, thus forming an image on the retina.
2. Telescopes
Telescopes consisting only of convex lenses sometimes produce distorted and blurred images. To correct this anomaly, both concave and convex lenses are used in the telescope. A concave lens placed in front of the eyepiece of a telescope helps to focus the image better, and a concave lens is used to obtain a clear magnified image, where the principle of aberration correction is mainly applied.
3. Flash lamps
When parallel light rays from a light source pass through a concave lens, the light rays diverge on the other side, thus increasing the radius of the light source and expanding the range of light propagation, which is why the concave lens is widely used in flashlights. It is also used in automobile headlamps because it is able to disperse light to a greater distance, which helps the driver to see distant vehicles clearly at night.
