condition for destructive interference d sin m 1

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Unformatted text preview: , …) 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: 2 =2 = d sin EP = E1 + E2 = E0 [sin t + sin( t + )] = 2 E0 cos tan = y / L , ybright y dark L m d L (m + 1 ) 2 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 d Iav = I0 cos2 y L y / L,...
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This document was uploaded on 04/06/2014.

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