What are the types of lenses you know? What lenses are collecting lenses? scattering?

Lenses are converging and diffusing. Lenses that are thicker in the middle than at the edges, which have the property of collecting a parallel beam of rays at one point, are called collecting lenses. Lenses that are thinner in the middle than at the edges and have the property of scattering a parallel beam of rays are called collecting lenses.

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