All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2010 Physics

Q. 26. As the beam enters the medium, it will

1. diverge
2. converge
3. diverge near the axis and converge near the periphery
4. travel as a cylindrical beam

Sol:

converging beam

Answer : (2)

Q. 27. The initial shape of the wavefront of the beam is

1. convex
2. concave
3. convex near the axis and concave near the periphery
4. planar

 Answer : (4)

Q. 28.The speed of light in the medium is

1. minimum on the axis of the beam
2. the same everywhere in the beam
3. directly proportional to the intensity I
4. maximum on the axis of the beam

Sol:

Refractive index is maximum at axis. Therefore speed of light at axis will be minimum.

Answer : (1)

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