achromatize การใช้

• In this manner the conditions are maintained that any one constant of reproduction is equal for two different colors, i . e . this constant is achromatized.
• For example, it is possible, with one thick lens in air, to achromatize the position of a focal plane of the magnitude of the focal length.
• If all three constants of reproduction be achromatized, then the Gaussian image for all distances of objects is the same for the two colors, and the system is said to be in " stable achromatism ."