PC20312 Wave Optics Section 1: Electromagnetism and Waves.
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PC20312 Wave Optics Section 1: Electromagnetism and Waves
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Transcript of PC20312 Wave Optics Section 1: Electromagnetism and Waves.
John Henry Poynting (1852-1914)
S = -1 E × B
The Poynting vector is where a beam of light is pointing.
Image from Wikipedia
Huygens’ wavelets
Click to Huygens’ wavelets demo
Or go to
http://www.acoustics.salford.ac.uk/feschools/waves/diffract3.htm
Fig 1.2 Law of reflection by Fermat
h1
h2
x l - x
S
P
i r
l
0dx
dL
Tutorial problem:
• Write optical path length, L, between S and P as function of x
• Find
• i = r when
dx
dL