p37_012

# p37_012 - 12. Consider Huygens’ explanation of...

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Unformatted text preview: 12. Consider Huygens’ explanation of diﬀraction phenomena. When A is in place only the Huygens’ wavelets that pass through the hole get to point P . Suppose they produce a resultant electric ﬁeld EA . When B is in place, the light that was blocked by A gets to P and the light that passed through the hole in A is blocked. Suppose the electric ﬁeld at P is now EB . The sum EA + EB is the resultant of all waves that get to P when neither A nor B are present. Since P is in the geometric shadow, this is zero. Thus EA = −EB , and since the intensity is proportional to the square of the electric ﬁeld, the intensity at P is the same when A is present as when B is present. ...
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## This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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