The phase difference between the coherent waves of wavelength lamda originating from two slits is 3pi radian A point P on a screen is at distance of 20lamda and 21.5lamda from the two slits .is the point P bright or dark.?

The phase difference between the coherent waves of wavelength lamda or

1.	The phase difference between the coherent waves of wavelength lamda originating from two slits is 3pi radian A point P on a screen is at distance of 20lamda and 21.5lamda from the two slits .is the point P bright or dark.?
Answer» Solution :A phase difference of `3pi` radian CORRESPONDS to a path difference of `1.5lamda` .HENCE the path difference between the waves from the TWO slits meeting at P is either `1.5lamda+-1.5lamda=3lamda` or 0. in either CASE path difference is an integral MULTIPLE of `lamda` hence the point P is bright.

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The phase difference between the coherent waves of wavelength lamda originating from two slits is 3pi radian A point P on a screen is at distance of 20lamda and 21.5lamda from the two slits .is the point P bright or dark.?

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