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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)

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)

Grade:11

1 Answers

SAGAR SINGH - IIT DELHI
878 Points
13 years ago

Dear student,

This is a simple formula based problem based on introduction of thin film..

The correct answer i got is 120 nm..

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All the best.

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Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

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