A thin film of thickness t and index of refraction 1.33 coats a glass with index of refraction 1.50.Which of the following thickness t will not reflect normally incident light with wavelength 640 nm in air?

120nm,240nm,300nm,480nm

(ans is 120 nm)

Dear student,

Its a formula based question(Introduction of thin film). The correct ans is 120 nm.

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