Which lens curves inward?

Which lens curves inward?

• A. Concave lens
• B. Convex lens
• C. Plane mirror
• D. Convex mirror

Answer: (A)

The shape of a lens determines how it bends light. A concave lens curves inward, meaning its surfaces bend toward the center and the lens is thinner at the middle. This inward curvature makes parallel light rays diverge as they pass through, appearing to come from a point on the same side of the lens. That diverging behavior is the hallmark of a concave lens, unlike a convex lens, which curves outward and converges light, or a flat plane surface or a convex mirror, which don’t curve inward. So the lens that curves inward is the concave lens.

The shape of a lens determines how it bends light. A concave lens curves inward, meaning its surfaces bend toward the center and the lens is thinner at the middle. This inward curvature makes parallel light rays diverge as they pass through, appearing to come from a point on the same side of the lens. That diverging behavior is the hallmark of a concave lens, unlike a convex lens, which curves outward and converges light, or a flat plane surface or a convex mirror, which don’t curve inward. So the lens that curves inward is the concave lens.