Smith-Helmholtz law

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Smith-Helmholtz law [′smith ′helm‚hōlts ‚lȯ]

(optics)

For a single refracting surface of sufficiently small aperture, the product of the index of refraction, distance from the optical axis, and the angle which a light ray makes with the optical axis at the object point is equal to the corresponding product at the image point.

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