# Lec-26 - Light Experimental Results – p Huygens’...

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Previous Lecture We completed the geometric optics of lenses and mirrors: location of images index of refraction dispersion total internal reflection Lensmaker’s Equation one and two lens systems optical aberrations – p.

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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.
Physical Optics Includes wave effects: diffraction and interference one slit, two slits, many slits – p.

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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 (Young)

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Unformatted text preview: Light Experimental Results – p. Huygens’ Principle Every point on a wave acts like a 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: Many Slits (a) Two slits (b) Many slits. We can still use mλ = d sin θ , but using many slits gives sharper peaks than two slits. – p. 1 Discrete and Continuous Spectra – p. 1...
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Lec-26 - Light Experimental Results – p Huygens’...

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