Physicshard · Past Paper
Cauchy's equation relates refractive index (n) and wavelength (λ) as:
An = A + B/λ^2
Bn = Aλ + B
Cn = A + Bλ
Dn = A/λ
✓ Correct Answer: A — n = A + B/λ^2
Cauchy's formula shows that refractive index decreases as wavelength increases.
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