IIT JEE , AIEEE Forum - Physics , Optics

Anurag.Seth

Q) Sodium light has two wavelengths

_¹ =589nm and

_{2 =589.6nm . As the path difference increases, when is the visibility of the fringes a minimum?}

prakharajabe

u can take indi. intensities and then take the resultant and find the max value....

krishna.gopal

When maxima of one corresponds to minima of other. This happens when path difference is of the order of (0.5)(589.3)^2/(0.6) nm

This length is called coharence length and is given by (lamda average)^2/(2*delta lamda)

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