Diffraction Grating.

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Interference in Thin Films

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Presentation transcript:

Diffraction Grating

A large number of equally spaced parallel slits is called a diffraction grating.

Why more slits yield sharper peaks?

The bright maxima are much sharper and narrower for grating.

Spectra Produced by a Grating

The Spectrometer and Spectroscopy

Interference by Thin Film

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.

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 n=1.35.