Question

Derive the condition of achromatism of two lenses in contact with each other .

Answer 1

Answer:

achromatic lens or achromat is a lens that is designed to limit the effects of chromatic and spherical aberration. Achromatic lenses are corrected to bring two wavelengths (typically red and blue) into focus on the same plane.

achromatism (uncountable) The state or quality of being achromatic; achromaticity. the achromatism of a lens. The state of being free of colors, not emitting or separating into colors. Achromatopia.

As the ray height at the lens increases, the position of the ray intersection with the optical axis moves farther and farther from the paraxial focus. ... For example, marginal spherical aberration refers to the aberration of the ray through the edge or margin of the lens aperture.

The simplest method of reducing spherical aberration is to place an aperture, hole or "stop", in front of or after the lens. The aperture blocks out rays that blur the image. ... The objective lens is at the bottom.

Chromatic aberration is caused by lens dispersion, with different colors of light travelling at different speeds while passing through a lens.

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