Plano-Concave Lenses

Plano-Concave lens has a negative focal length,diverges collimated incident light, and forms only virtual images which are seen through the lens. It is often used to expand light beams or increase focal lengths in existing systems. The parameter follow the formulas as below: 

In a Lens, the following parameter are usually used to declare it: diameter(Φ),central thickness(tc),radius(R),edge thickness(te),focal length(f),reflective index. These parameters follow the following formulas:


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