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in Ray Optics and Optical Instruments by (26.7k points)
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Which of the following is correct for the beam which enters the medium?

(a) Travel as a cylindrical beam

(b) Diverge

(c) Converge

(d) Diverge near the axis and converge near the periphery

1 Answer

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by (26.2k points)
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Best answer

(c) Converge.

Explanation:

Since the refractive index is less at the beam boundary, the ray at the edges of the beam move faster compared to the axis of beam. Hence, the beam converges.

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