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2 The resultant electric field at
P: m: order number
• For small angle (<15°), useing sin
The positions of the bright fringes:
The positions of the dark fringes: E2 = E0 sin( t + )
The phase difference:
d sin EP = E1 + E2 = E0 [sin t + sin( t + )] = 2 E0 cos tan = y / L ,
y dark L
(m + 1 )
d The intensity at P: I EP 2 = 4 E0 2 cos 2 The average intensity: 2 sin 2 t+ 2 2 sin t+ 2 Iav = I0 cos2 d sin For small angle, using sin
Iav = I0 cos2
L y / L,...
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This document was uploaded on 04/06/2014.
- Spring '14