Find the minimum thickness of a film with refractive index \( 1.33 \) at which light with wavele...

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Find the minimum thickness of a film with refractive index \( 1.33 \) at which light with wavelength \( 0.64 \mu \mathrm{m} \) experiences maximum reflection while light with wavelength \( 0.40 \mu \mathrm{m} \) is not reflected at all. The incidence angle of light is equal to \( 30^{\circ} \).
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