The expiration date on a product refers to the last date a product should be

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

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explanation:

there is no change in the electric potential energy as it is in rest on both conditions.