IIT JEE , AIEEE Forum - Physics , Optics

tejas.ahobala

a trihedral prism with refracting angle 60 provides the least deflection angle 37 in air. find the least deflection angle of that prism in water.

krishna.gopal

Let refractive index of material be n.
So n = sin((A+da)/2)/sin(A/2)
where A is angle of prism = 60
da is angle of least deviation = 37
This gives n

For the case of water (refractive index = 1.33) refractive index of medium is n/1.33.
So n/1.33 = sin((A+dw)/2)/sin(A/2)
From this solve for dw

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