In the Fresnel bi-prism experiment, the refractive index for the bi-prism is μ=3/2 and fringe width obtained is 0.4mm. If the whole apparatus is immersed as such in water then the fringe width will become(refractive index of water is 4/3).
A
0.3mm
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B
0.225mm
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C
0.4mm
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D
1.2mm
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Solution
The correct option is D1.2mm In a fresnel bi-prism, fringe width,ωmedium=Dλmediumdmedium