A bi-concave (double concave) lens has the same radius of curvature on both sides of the lens and functions like a plano-concave lens by diverging collimated incident light.
Definition of Double Concave Lens
Double-Concave Lenses (DCV or Biconcave Lenses) are employed in beam expansion, image reduction, and light projection applications. These lenses are also great for extending an optical system's focal length. Optical lenses with negative focal lengths are double-concave lenses, which feature two concave surfaces.
The concave lens deflects a straight ray from the light source and reduces an upright virtual image. It has the ability to create both real and virtual images. At least the inner surface of the concave lens is curved.
Concave lenses are also called diffuse lenses because the center is curved inward, and the edges are curved outward to diffuse the light. They are used to treat myopia because they make distant objects look smaller.
If the object-image conjugate ratio is close to 1: 1 and the input beam is converging, a biconcave lens is best. The exit ray of the virtual image diverges (on the object side). The distance between the virtual image and the lens is called the focal length.
These are commonly used in existing systems such as beam expanders and projection systems to increase illumination and focal length. Suitable when the object and image are about 1: 1 conjugate to the conjugate input beam.
Q. What is another name for a double concave lens?
Concave-concave lens or Biconcave lens.
Q. What is a double lens?
If your prescription glasses have two distinct sections in the lenses, you most certainly have what is known as bifocals. This is referred to as a double lens.
Q. In which category is a double concave lens placed?
This type of lens is a diverging lens.
We hope you enjoyed studying this lesson and learned something cool about Double Concave Lens! Join our Discord community to get any questions you may have answered and to engage with other students just like you! We promise, it makes studying much more fun!😎