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  4. Two plane wavefronts of light, one incident on a thin convex lens and another on the refracting face of a term prism. After refraction at them, the emerging wavefronts respectively become

Q. Two plane wavefronts of light, one incident on a thin convex lens and another on the refracting face of a term prism. After refraction at them, the emerging wavefronts respectively become

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Solution:

Two plane wavefronts of light one incident on a thin convex lens and another on the refracting face of a thin prism. After refraction at the two surfaces, the emerging wave respectively have spherical wavefront and plane wavefront are shown in the diagrams (a) and (b).
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