refractive index of diamond and definition of power of lens
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2.417
Diamonds refractive index is a measurement of 2.417. This means that light travels through a diamond 2.417 slower than it travels through air.
The power of a lens is defined as the reciprocal of the focal length. ... Converging (convex ) lenses have positive focal lengths, so they also have positive power values. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.
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