Lecture_17

# Lecture_17 - Lecture 17-1 Lecture Geometric Optics vs Wave...

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Lecture 17 Lecture 17 -1 Geometric Optics vs Wave Optics Geometric optics is a limit of the general optics where wave effects such as interference and diffraction are negligible. ¾ Geometric optics applies when objects and apertures involved are much larger than the wavelength of light. ¾ In geometric optics, the propagation of light can be analyzed using rays alone (where the underlying wave nature can be encapsulated into a few rules such as the laws of reflection and refraction).

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Lecture 17 Lecture 17 -2 Wave Optics Wave optics (sometimes also referred to as physical optics ) - wave effects play important roles. ¾ Wave optics applies when objects and apertures are comparable to or smaller than the wavelength of light. ¾ In wave optics, we must directly use the concepts relevant to waves such as phases, coherence, and interference .
Lecture 17 Lecture 17 -3 Coherence When the difference in phase between two (or more) waves remains constant (i.e., time-independent), the waves are said to be perfectly coherent . Only coherent waves can produce interference fringes (fixed patterns)! A single light wave is said to be coherent if any two points along the propagation path maintains a constant phase difference .

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Lecture_17 - Lecture 17-1 Lecture Geometric Optics vs Wave...

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