here is the link :  http://discovery.bits-pilani.ac.in/~raj/fresnel-biprism.pdf


or try [url=http://discovery.bits-pilani.ac.in/~raj/fresnel-biprism.pdf]http://discovery.bits-pilani.ac.in/~raj/fresnel-biprism.pdf[/url]


else try : [code]http://discovery.bits-pilani.ac.in/~raj/fresnel-biprism.pdf[/code]

[code]http://discovery.bits-pilani.ac.in/~raj/fresnel-biprism.pdf[/code]