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(D) The optical path length is defined as the product of the refractive index of the medium and the geometric distance traveled by the light.In vacuum

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is increased by $(n-1) t$.

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(D) The optical path length is defined as the product of the refractive index of the medium and the geometric distance traveled by the light.In vacuum (or air),the optical path for a distance $t$ is $t_{opt} = 1 	imes t = t$.When a mica film of thickness $t$ and refractive index $n$ is introduced,the light travels a distance $t$ through the film.The optical path through the film is $t'_{opt} = n 	imes t = nt$.The change in optical path is $\Delta = t'_{opt} - t_{opt} = nt - t = (n-1)t$.Since $n > 1$,the optical path increases by $(n-1)t$.

$A$ ray of light from a monochromatic point source of light is incident at a point on the screen. If a thin mica film of thickness $t$ and refractive index $n$ is introduced in its path,then the optical path

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