lecture33 - Interference effects for continuous sources: i)...

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Unformatted text preview: Interference effects for continuous sources: i) Light bends around corners. ii) Shadows fill in iii) Parallel beams always spread iv) Limits of resolution of microscopes and telescopes Diffraction Ch 38 Diffraction Ch 38 Fraunhofer Diffraction : (easy math) Source, screen at infinity, ~parallel rays eg. Laser & narrow slit. Fresnel Diffraction : (complicated math) Source distance, object size and screen distance all comparable. eg. Source Steel Ball Screen Shadow Poisson Spot Single Slit, width = Single Slit, width = a a a 5 4 3 2 1 Use Huygenss idea: Treat the slit as a large number of point sources. x = a sin is path difference between waves at two edges (Fraunhoffer diffraction) Divide slit in half and add up rays in pairs : Ray (1) travels farther than ray (3): when it is cycle behind -> Cancel Ray (2) travels farther than ray (4): when it is cycle behind -> Cancel Ray (3) travels farther than ray (5): when it is cycle behind -> Cancel...
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lecture33 - Interference effects for continuous sources: i)...

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