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What is a convex and concave lense?

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Answer:

A convex or "positive" lens is thicker in the middle and thinner at the edges. A concave, or "negative" lens is thinner at the middle and thicker at the edges. Convex lenses project a real image behind the lens; concave lenses project a virtual image in front of the lens.

First answer by Michael Cleveland. Last edit by Michael Cleveland. Contributor trust: 43 [recommend contributor ]. Question popularity: 1 [recommend question].

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