Interference-and-Diffraction

Interference-and-Diffraction - Wave Optics Wave Optics...

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Unformatted text preview: Wave Optics Wave Optics Water wave passing though an opening Sharp shadow The wave nature of light is needed to explain various phenomena Interference Diffraction The particle nature of light was the basis for ray (geometric) optics Interference of light Youngs double slit experiment Observed interference fringes Interference Constructive interference occurs when the path-length difference is integer multiple of the wavelength In small-angle approximation, angle of bight fringes is The position of bright fringes can be found The fringe spacing is independent of m m sin d r = = ... , 3 , 2 , 1 , m , d L m y tan L y m = = = ... 3 , 2 , 1 , m , d m m = = d L y y y m 1 m =- = + Interference Destructive interference occurs when the path-length difference is a half-integer number of wavelengths Dark fringes are located exactly halfway between the bright fringes. ... , 2 , 1 , m 2 1 m r = + = ... , 2 , 1 , m , d L 2 1 m ' y m = + = Intensity in a double-slit interference In general, intensity proportional to the square of the amplitude of the wave. The net amplitude of superimposed wave is given by The phase difference at position y is The light intensity is then = 2 cos a 2 A Where a is the amplitude of each individual wave y L...
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This note was uploaded on 02/02/2012 for the course PHYSICS PHYS270 taught by Professor H.bantu during the Fall '10 term at Maryland.

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Interference-and-Diffraction - Wave Optics Wave Optics...

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