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How is a wavefront related to the direct...

How is a wavefront related to the direction of corresponding rays ?

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Wavefront is always normal to the rays correcponding to it.
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Knowledge Check

  • Wavefront means

    A
    All particles in it have same phase
    B
    All particles have opposite phase of vibrations
    C
    Few particles are in same phase, rest are in opposite phase
    D
    None of these

  • When a magnetic field is applied in a direction perpendicular to the direction of cathode rays, then their

    A
    Energy decreases
    B
    Energy increases
    C
    Momentum increases
    D
    Momentum and energy remain unchanged

  • In the adjacent diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on theta for constructive interference at P between the ray BP and reflected ray OP.

    A
    `costheta=(3lamda)/(2d)`
    B
    `costheta=(lamda)/(4d)`
    C
    `sectheta-costheta=(lamda)/(d)`
    D
    `sectheta-costheta=(lamda)/(d)`

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    Plane parallel wavefornts encounter the interference one medium and another as shown below The wave speed is different in the two media. what will happen to the distance between wavefront and the direction of travel wavefronts as the waves enter the second media?

    A perpendicular drawn to the wavefront in the direction of propagation of light is

    A wavefront and a ray of light are

    Wavefront of a wave has direction with wave motion

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