Frequently Asked Questions

Plano-concave lenses are lenses with one side flat and the other side concave.A biconcave lens means that both sides of the lens are concave.

It can be used in optical systems to expand beams, project light, and expand the focal length of optical systems.

There are also two straight lines from the top of the object: one is parallel to the main optical axis, and is deflected into divergent rays after passing through the biconcave lens, and returns the refracted rays in the opposite direction to the main focus; the other passes through the optical center point of the lens. These two straight lines When straight lines intersect at a point, this is the image of an object.

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