optical power and refractive index

Optical power refers to the ability of a lens or optical system to converge or diverge light rays. It is a measure of how strongly a lens can bend light, and is often quantified in units called diopters. Refractive index, on the other hand, refers to the measure of how much a material can bend light as it passes through it. It is a ratio of the speed of light in a vacuum to the speed of light in the material. The refractive index determines how much light rays get bent or deviated when they pass through different media, such as air, water, or glass.

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