Diffraction Grating

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Diffraction Grating
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A large number of equally spaced parallel slits
is called a diffraction grating.
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Why more slits yield sharper peaks?
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The bright maxima are much sharper and narrower
for grating.
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Spectra Produced by a Grating
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The Spectrometer and Spectroscopy
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Interference by Thin Film
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A beam of light reflected by a material whose
index of refraction is greater than that of the
material in which it is traveling, changes phase
by ½ cycle.
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Thickness of a soap bubble skin A soap bubble
appears green ( wavelength 540 nm) at the point
on its front surface nearest the viewer. What is
its minimum thickness? Assume n1.35.