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An initially parallel cylindrical beam travels in a medium of refractive index μ(I)= 0+ 2 I, where 0 and 2 are positive constants and I is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius. As the beam enters the medium, it will

diverge near the axis and converge near the periphery

Ray Optics

JEE Main level, single correct, medium

119 of 295

Question 119 of 295

An initially parallel cylindrical beam travels in a medium of refractive index $\mu(I)=\mu_0+\mu_2 I$ , where $\mu_0$ and $\mu_2$ are positive constants and $\mathrm{I}$ is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius.
As the beam enters the medium, it will

Show answer and solution

Answer: (B) converge

As intensity is maximum at axis,

\therefore \quad \mu

will be maximum and speed will be minimum on the axis of the beam.

\therefore \quad

beam will converge.

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JEE Main 2025 Apr 2 Shift 1 question paper

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JEE Main Physics practice question on Ray Optics (Refraction of light from plane surface), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.