How can you identify convex or concave lens without touching them?
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Explanation:The simplest way is to hold a convex lens up near the eye and look distant objects through it; then move the lens a little from side to side, the distant object will move in a direction opposite to the movement of the lens. If it is a concave lens then the distant object will move in the same direction as the lens.
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Concave lens = A concave lens is thinner at the centre than at the edges.
Concex lens = Magnifying lens is a convex lens.
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