Question

to what is concave lens or convex lens
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Answer 1

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Answer :

For a converging lens (for example a convex lens), the focal length is positive. On the other hand, the focal length of concave lens is negative. Thus, for convex lens, the focal length is a distance over which all the parallel rays will converge

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Answer 2

Answer:

✌concave lens- concave lens is a lens which is thicker at the edges and thinner at the middle

✌convex lens- it is a lens which is thicker in the middle and thinner at the edges