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Questions  >>  CBSE XII  >>  Physics  >>  Wave optics
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Find the minimum thickness of a film which will strongly reflected the light of wavelength $589\;nm$ The refractive index of the material of the film is $1.25$

$\begin{array}{1 1} 11.8\;nm \\ 1.18\;nm \\ 118\;nm \\ none\;of\;these \end{array} $

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