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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 27 - Wave Optics > A parallel beam of white light is incident on a thin film of air of uniform thickness. Wavelength 7200Å and 5400Å are observed to be missing from the spectrum of reflected light viewed normally. The other wavelength in the visible region missing in the reflected spectrum is

A parallel beam of white light is incident on a thin film of air of uniform thickness. Wavelength 7200Å and 5400Å are observed to be missing from the spectrum of reflected light viewed normally. The other wavelength in the visible region missing in the reflected spectrum is

What happens to the interference pattern if the two slits in Young's experiment are illuminated by two independent sources such as two sodium lamps S and S′ as shown in figure.