Question

What causes chromatic aberration?
(a) Non - paraxial rays
(b) Paraxial rays
(c) Variation of focal length with colour
(d) Difference in radii of curvature of the bounding surfaces
of the lens

Answer 1

Explanation:

fringing or dispersion) is a common problem in lenses which occurs when colors are incorrectly refracted (bent) by the lens, resulting in a mismatch at the focal point where the colors do not combine as

Answer 2

Answer:

ans. is (c). variation of focal length with colour