| 释义 |
Smith-Helmholtz law 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. |