what is lens how many types of lenses are there
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Lens is the substance which is used to sea small objects. There are two types of lens they are-[concave lens and convex lens]
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Lens are used to see small things or an objects.
There are two types of lens they are
1)concave lens
2) convex lens
There are two types of lens they are
1)concave lens
2) convex lens
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