JEE Main Physics Class 12 Wave Optics Part 1 Questions

Directions: Questions number 13−15 are based on the following paragraph.
An initially parallel cylindrical beam travels in a medium of refractive index µ(I)=µ0+µ2I, where µ0 and µ2 are positive constants and I is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius