What is the formula for the power of a lens?

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Multiple Choice

What is the formula for the power of a lens?

Explanation:
Power of a lens measures how strongly it bends light, and it is defined as the reciprocal of its focal length: P = 1/f, with f in meters giving P in diopters. This means a shorter focal length corresponds to greater power, while a longer focal length gives less power. Positive power indicates a converging lens and negative power indicates a diverging lens. For example, if f = 0.5 m, then P = 2 diopters. Using P = f, P = f^2, or P = 1/d would not correctly describe lens power, since those forms don’t relate to how a lens bends light in the standard definition.

Power of a lens measures how strongly it bends light, and it is defined as the reciprocal of its focal length: P = 1/f, with f in meters giving P in diopters. This means a shorter focal length corresponds to greater power, while a longer focal length gives less power. Positive power indicates a converging lens and negative power indicates a diverging lens. For example, if f = 0.5 m, then P = 2 diopters. Using P = f, P = f^2, or P = 1/d would not correctly describe lens power, since those forms don’t relate to how a lens bends light in the standard definition.

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