Which lens is thicker in the center than at the edges?

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Multiple Choice

Which lens is thicker in the center than at the edges?

Explanation:
Thickness in the middle comes from surfaces that bulge outward. When the lens is thicker at the center than at the edges, it’s a convex lens, which curves outward on both sides and acts to converge light to a point. A concave lens curves inward, becoming thinner in the middle and diverging light. A plano lens has a flat side, so its center thickness isn’t defined by a bulge, and a spherical lens can be either convex or concave depending on the curvature.

Thickness in the middle comes from surfaces that bulge outward. When the lens is thicker at the center than at the edges, it’s a convex lens, which curves outward on both sides and acts to converge light to a point. A concave lens curves inward, becoming thinner in the middle and diverging light. A plano lens has a flat side, so its center thickness isn’t defined by a bulge, and a spherical lens can be either convex or concave depending on the curvature.

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