A plano concave lens is an optical lens with one concave surface and one flat surface. It has a negative focal length, and can be used for light projection, beam expansion, or to increase focal length ...

LEDtronics built its latest high-intensity discrete LED with a concave lens, so the 5-mm-wide T1-¾ device delivers light that is even from the center to the edge. This lens spreads the inherently ...

Positive meniscus lenses are used to decrease the focal length of another lens while maintaining the angular resolution of the optical assembly. These lenses are commonly used to achieve tighter beam ...