1.

The obtuse angle of Fresnel's biprism is 178^(@). A slit is illuminated by light to wavelenght 6000Å is at distance of 10 cm from the biprism. Find the fringe widht on a screen at a distance of 90 cm from the biprism . The refractive index of the material of the birism is 1.5

Answer»

`0.000344 MM`
`0.0034 mm`
`0.034 mm`
`0.34 mm`

Solution :`alpha=1^(@),LAMDA=6000A^(@),D=1m,beta=?`
`mu=1.5,u=10cm`
`d=2u(mu-1)alpha`
`=(2xx0.1(1.5-1)xx1)/(57)`
`beta=(D)/(d)lamda=(1xx6xx10^(-7)xx57)/(0.1)`
`=3.4xx10^(-5)m`
`=0.034mm`


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