A ray of light parallel to the axis of a converging lens (having focal length f ) strikes it at a small distance ' h ' from its optical centre. A thin prism having angle θ and refractive ind

Question

A ray of light parallel to the axis of a converging lens (having focal length $f$ ) strikes it at a small distance ' $h$ ' from its optical centre. A thin prism having angle $θ$ and refractive index $μ$ is placed normal to the axis of lens at a distance ' $d$ ' from it. What should be the value of $μ$ so that the ray emerges parallel to the lens axis.

TestHub · Accepted Answer

tan δ 1 ​ = f h ​ (lens deviation) Net deviation 0 = − δ L ​ + δ P ​ f h ​ = ( μ − 1 ) θ μ = f θ h ​ + 1

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