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## Main Question or Discussion Point

In optics, given the below formula

n

where A, B and C are constants.

From the above relationship we can deduce that as the wavelength λ increases, the variation of refractive index n

How do we measure the constant value of A,B and C at the first place?

n

_{λ}= A + B/λ^{2}+ C/λ^{4}+......where A, B and C are constants.

From the above relationship we can deduce that as the wavelength λ increases, the variation of refractive index n

_{λ}decreases.How do we measure the constant value of A,B and C at the first place?