Mathematical Derivation
n=c/v=γ/γ° where c-speed of light in vacuum, v -speed of light in medium,γ-wavelength in vacuum,γ°-wavelength in medium similarly n=d/d° d-distance traveled by light in vacuum in time t,d°-distance traveled by light in medium in time t
multiply both side by d° hence d=n*d° is the optical path
Read more about this topic: Optical Path Length
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