Question

The dispersive power of material of a lens of focal length 20 cm is 0.08. What is the longitudinal chromatic aberration of the lens?(a) 0.08 cm(b) 0.08/20 cm(c) 1.6 cm(d) 0.16 cm

Answer 1

Answer:

C) 1.6 cm

Explanation:

Chromatic aberration, is a common optical problem that occurs when the lens is either unable to bring all wavelengths of colour to the same focal plane, or when the wavelengths of colour are focused at different positions in the focal plane.

Focal length = 20cm (Given)

Dispersive power = 0.08  (Given)

Long chromatic aberration= w*f

= 20×0.08

= 1.6 cm

Thus, the longitudinal chromatic aberration of the lens is 1.6cm

Answer 2

Answer:

Longitudinal chromatic aberration =ωf

=0.08×20=1.6cm

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