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NEET-XII-Physics

10: Wave Optics

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  • #2
    What is the shape of the wavefront in each of the following cases:
    (a) Light diverging from a point source.
    (b) Light emerging out of a convex lens when a point source is placed at its focus.
    (c) The portion of the wavefront of light from a distant star intercepted by the Earth.
    Ans : null (a) The shape of the wavefront in case of a light diverging from a point source is spherical. The wavefront emanating from a point source is shown in the given figure.


    (b) The shape of the wavefront in case of a light emerging out of a convex lens when a point source is placed at its focus is a parallel grid. This is shown in the given figure.


    (c) The portion of the wavefront of light from a distant star intercepted by the Earth is a plane.
  • #2-a
    Light diverging from a point source.
    Ans : The shape of the wavefront in case of a light diverging from a point source is spherical. The wavefront emanating from a point source is shown in the given figure.


  • #2-b
    Light emerging out of a convex lens when a point source is placed at its focus.
    Ans : The shape of the wavefront in case of a light emerging out of a convex lens when a point source is placed at its focus is a parallel grid. This is shown in the given figure.


  • #2-c
    The portion of the wavefront of light from a distant star intercepted by the Earth.
    Ans : The portion of the wavefront of light from a distant star intercepted by the Earth is a plane.