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A thin biprism (see Fig..) of obtuse angle alpha=178^(@) is places at a distance l=20cm from a slit. How many images are formed and what is the separation between them? Refrative index of the material mu=1.6 . |
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Answer» Solution :Two images are formed by the two thin PRISMS - one above the axis and the other below the axis by the same distance. The refracting ABLE of each thin prism is `(PI-alpha)/(2)=(1)/(2)(pi-alpha)` Then, `delta` (deviation of a ray) =`(mu-1)(1)/(2)(pi-alpha)` `d/2=ldelta` `d=2l(mu-1)(1)/(2)(pi-alpha)` `d=(mu-1)l(pi-alpha)` `d=(1.6-1)xx0.20(pi-178xx(pi)/(180))` `= 0.6xx0.20xxpixx(1)/(90)=0.004m=4mm` |
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