They are brought to a focus by a second lens ( bottom ) where an interference pattern is observed to determine the optical path difference in terms of wavelengths of the light.
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I AM CONFUSED THAT IS PATH DIFFERENCE NECESSARY FOR INTERFERENCE ? CAN INTERFERENCE TAKE PLACE WITHOUT PATH DIFFERENCE ? Preceding contribs ) 11 : 48, 15 May 2011 ( UTC)
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I AM CONFUSED THAT IS PATH DIFFERENCE NECESSARY FOR INTERFERENCE ? CAN INTERFERENCE TAKE PLACE WITHOUT PATH DIFFERENCE ? Preceding contribs ) 11 : 48, 15 May 2011 ( UTC)
24.
Wedged shear plates produce a graded path difference between the front and back surface reflections; as a consequence, a parallel beam of light produces a linear fringe pattern within the overlap.
25.
The notion of path difference and constructive or destructive interference used above for the double-slit experiment applies as well to the display of a single slit of light intercepted on a screen.
26.
The bottom panel shows a path that is made a half wavelength longer by moving the left-hand mirror a quarter wavelength further away, increasing the path difference by a half wavelength.
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The total phase difference is derived from the sum of both the path difference and the initial phase difference ( if the X-ray waves are generated from two or more different sources ).
28.
The path difference is given by \ frac { d \ sin ( \ theta ) } { 2 } so that the minimum intensity occurs at an angle " ? " min given by
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The condition for constructive interference in the \ scriptstyle \ hat { n } ^ \ prime direction is that the path difference between the photons is an integer multiple ( m ) of their wavelength.
30.
Since white light fringes are obtained only when the two waves have travelled equal distances from the light source, they can be very useful in interferometry, as they allow the zero path difference fringe to be identified.
