If a thin film of thickness $ t $ and refractive index $ \mu $ is placed in the path of light coming from a source $ S $, then increase in length of optical path is

Question

If a thin film of thickness $ t $ and refractive index $ \mu $ is placed in the path of light coming from a source $ S $, then increase in length of optical path is, $ \mu \mathrm{t} $, $ \mu / \mathrm{t} $, $ (\mu-1) \mathrm{t} $, None of these

MARKS App · Accepted Answer

Increase in optical path = μ t - t = μ - 1 t

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