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Which lens is powerful?

Published in Optics 1 min read

A thick convex lens is generally considered more powerful than other types of lenses.

Here's why:

  • Lens Power and Focal Length: The power of a lens is inversely proportional to its focal length. This means a lens with a shorter focal length has greater power. Lens power (P) is measured in diopters (D), where P = 1/f (and 'f' is the focal length in meters).

  • Convex Lenses: Convex lenses converge light rays. A thicker convex lens bends light more sharply, resulting in a shorter focal length.

  • Thickness and Curvature: Increased thickness generally correlates with increased curvature. Higher curvature means a shorter focal length.

  • Power Comparison: A thick convex lens bends light more strongly than a thin convex lens or a concave lens. This greater bending translates directly to a shorter focal length and, therefore, higher optical power.

In summary, a thick convex lens possesses greater optical power due to its ability to converge light more strongly, resulting in a shorter focal length.