# Chapters 29 Interference and Diffraction. Topics Huygens Principal Diffraction Interference –two slit –thin film Polarization Holography.

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Chapters 29 Interference and Diffraction

Topics Huygens Principal Diffraction Interference –two slit –thin film Polarization Holography

Huygens Principle

Diffraction http://ngsir.netfirms.com/applets/diffraction/2X/Diffraction.htm

Diffraction

Interference

Two Slit Interference

Double Slit Interference

Thin Film Interference

Polarization http://www.lon-capa.org/~mmp/kap24/polarizers/Polarizer.htm

Clicker Questions 1)Consider plane waves incident upon a barrier with a small opening. After passing through the opening, the waves A) become polarized. B) continue as plane waves. C) fan out. D) converge. E) all of these 2) Waves diffract the most when their wavelength is A) long. B) short. C) Both diffract the same. 3) Colors seen when gasoline forms a thin film on water are a demonstration of A) interference. B) refraction. C) polarization. D) reflection. E) dispersion.

Clicker Questions 4) The vibrational direction of the electron and the plane of polarization of the light it A) are the same. B) are at right angles to each other. C) are independent of each other. D) may or may not be at right angles to each other. 5) An ideal Polaroid will transmit 50% of unpolarized light incident on it. How much light is transmitted by two ideal Polaroids that are oriented with their axes parallel to each other? A) between 50% and 100% B) 100% C) between 0% and 50% D) 50% E) 0%

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