What is the lens in my spectacles? Is it concave or convex? How do I find that? - Quora
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what is differences between concave and convex lens - Brainly.in
What are the differences between a convex lens and a concave lens? - Quora
What is concave and convex in general???????? What are they in terms of mirrors as well as in terms of lens?????????? Why are they different in lenses and mirrors???????? Is there any
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Concave and Convex lens
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