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An initially parallel cylindrical beam t...

An initially parallel cylindrical beam travels in a medium of refractive index `mu(I)=mu_0+mu_2I`, where `mu_0` and `mu_2` are positive constants and I is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius.
31. The initial shape of the wavefront of the beam is

A

convex

B

concave

C

convex near the axis and concave near the periphery

D

planar

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The correct Answer is:
D
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MOTION-GEOMETRICAL OPTICS-Exercise - 4 | Level-II
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  3. An initially parallel cylindrical beam travels in a medium of refracti...

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  4. The speed of light in the medium is

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  6. Water (with refractive index = 4/3) in a tank is 18 cm deep. Oil of re...

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  8. Most materials have the refractive index, n gt 1. So, when a light ray...

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  9. Most materials have the refractive index, n gt 1. So, when a light ray...

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  10. The image of an object, forme by a plano-convex lens at a distance of ...

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  11. A ray of light travelling in the direction (1)/(2)(hat(i)+sqrt(3)hat(j...

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  12. A right angled prism of refractive index mu(1) is placed in a rectangu...

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  13. A point source S is placed at the bottom of a tranparent block of heig...

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  14. Four combinations of two thin lenses are given in List I. The radius o...

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  15. A transparent thin film of uniform thickness and refractive index n(1)...

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  16. Consider a concave mirror and a convex lens (refractive index 1.5) of ...

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  17. Two identical glass rods S(1) and S(2) (refractive index=1.5) have one...

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  18. A monochromatic beam of light is incident at 60^@ on one face of an eq...

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