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What is the shape of a wavefront at a la...

What is the shape of a wavefront at a large distance away from a point source?

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Plane wavefront
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Knowledge Check

  • The illuminance at at distance 5 meter from a 200 candle source is

    A
    `"10 lumens/m"^(2)`
    B
    `"24 lumens/m"^(2)`
    C
    `"8 lumens/m"^(2)`
    D
    `"4 lumens/m"^(2)`

  • The intensity of illumination at a distances of 5 m from a 200 candela source is

    A
    10 lux
    B
    8 lux
    C
    24 lux
    D
    4 lux

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    What is the shape of equipotential surface around the point charge ?

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    Magnetic field B on the axis of a circular coil and far away distance x from the centre of the coil are related as :

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