A real image of a distant object is formed by a plano-convex lens on its principal axis. Spherical aberration is :
smaller, if the curved surfaces of the lens face an object.
smaller, if the plane surface of the lens faces the object.
same, whichever side of the lens faces the object.
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Correct option is B)
spherical aberration for a plano-convex lens will be
minimum when the curved surface faces the object and then the light from the object will fall on the curved surface. ∙This is because the total deviation of the ray is distributed between the two surfaces. Th total deviation is shared by both the surfaces.
Hence, the spherical aberration is smaller if the curved surface of the lens faces the object.
The correct answer is option (B).
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