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# slides25all - point source of an outgoing wave. This idea...

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Geometric Optics Light travels in straight-line “rays” Works well for describing images created by lenses and mirrors Does not describe wave nature of light. – p.

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Physical Optics Includes wave effects: diffraction and interference one slit, two slits, many slits – p.
Physical Optics Includes wave effects: diffraction and interference one slit, two slits, many slits Diffraction vs. Interference: one or many slits = diffraction two slits = interference – p.

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Two-slit experiment Prediction of Ray Model Light – p.
Two-slit experiment Light Experimental Results – p.

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Huygens’ Principle Every point on a wave acts like a

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Unformatted text preview: point source of an outgoing wave. This idea can explain Young’s expt. – p. Two-slit interference pattern The data look like this. – p. Two-slit interference pattern Typical picture to illustrate the data. – p. Two-slit interference pattern Interpretation of the results: L L L Bright Dark Bright Two slits Screen same distance extra distance λ /2 extra distance λ from Fig.35-7 d – p. Diffraction Grating Still use mλ = d sin θ , but many slits give sharper peaks than two slits. – p. Discrete & continuous spectra Fig. 36-19 – p. 1...
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## This note was uploaded on 08/06/2008 for the course PHYS 21 taught by Professor Hickman during the Fall '07 term at Lehigh University .

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slides25all - point source of an outgoing wave. This idea...

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