Question

The Cauchy's dispersion formula is

• A. $n=A+B\lambda^{-2}+C\lambda^{-4}$
• B. $n=A+B\lambda^{-2}+C\lambda^{4}$
• C. $n=A+B\lambda^{2}+C\lambda^{-4}$
• D. $n=A+B\lambda^{2}+C\lambda^{4}$

Answer 1

The Correct Option is A

The Cauchy's dispersion formula represents the dispersion of most of the substances with considerable accuracy. Also from the Cauchy's dispersion formula if \(n\) is refractive index and \(A, B\) and \(C\) are constants, then
\(n = A + B \lambda^{-2} + C\lambda^{-4}\)

So, the correct option is (A): \(n = A + B \lambda^{-2} + C\lambda^{-4}\)