The Cauchy's formula is

Options

A. (a) `mu=A+Blambda^2+Clambda^4`
B. (b) `h=A+Blambda^2+Clambda^2`
C. (c) `mu=A+Blambda^2+Clambda^4`
D. (d) `mu=A+Blambda^-2+Clambda^-4`

Answer

D

Explanation

From Cauchy's dispersion formula the refractive index `(mu)` and wavelength `(lambda)` are related as follows:
`mu=A+B/lambda^2+C/lambda^4`
`impliesmu=A+Blambda^-2+Clambda^-4`