What is convex and concave?

Tell the answer my dear friends.......

A?concave lens is thinner in the middle and thicker at the edges. A?convex lens is thicker in the middle and thinner at the edges. Also known as. It is also known as Diverging?Lens. It is also known as?Converging Lens.
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Thanks vanshika for your help......
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Concave lens is thin in the middle and thick at the ends...
And convex is just opposite to concave lebs
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