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Unformatted text preview: cture 26 cture 26 1 Lens Equation 1 1 1 p q f + = ( < 0 ) True for thin lens and paraxial rays . magnification m = h’/h =  q/p cture 26 cture 26 2 Signs in the Lens Equation for Thin Lenses 1 1 1 p q f + = q m p =  • p is positive for real object • q is positive for real image • q is negative for virtual image • m is positive if image is upright • m is negative if image is inverted • f is positive if converging lens • f is negative if diverging lens i o y f q q y f p = =  • p is negative for virtual object cture 26 cture 26 3 Geometric Optics vs Wave Optics • Geometric optics is a limit of the general optics where wave effects such as interference and diffraction are negligible. Geometric optics applies when objects and apertures involved are much larger than the wavelength of light. In geometric optics, the propagation of light can be analyzed using rays alone. • Wave optics (sometimes also called physical optics )  wave effects play important roles. Wave optics applies when objects and apertures are comparable to or smaller than the wavelength of light. In wave optics, we must use the concepts relevant to waves such as phases, coherence, and interference . cture 26 cture 26 4 READING QUIZ 1 Which of the following statements is incorrect ? A Wave optics applies when objects and apertures are comparable or smaller than the wavelength of light. B Two light waves of different frequency f = c/λ , where λ is the wavelength and c is the light velocity, exhibit interference fringes. C When the difference in phase of two or more waves remains constant (time independent) the waves are perfectly coherent. D A LASER is a source of a single frequency perfectly coherent light. E An incandescent light emits light that has a short (~ 1 meter ) coherence length. cture 26 cture 26 5 Coherence When the difference in phase between two (or more) waves remains constant (i.e., timeindependent), the waves are said to be perfectly coherent ....
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 Fall '08
 Wei
 Light, Wavelength, Ture

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