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Concepts Of Physics MCQ Edition [Volume 1]PhysicsLight Waves

Light waves propagate in a vacuum along the X-axis. Which of the following equations may represent the wavefronts?

Options

  1. Ay = c
  2. Bz = c
  3. Cx = c
  4. Dx + y + z = c

Correct answer

C. x = c

Step-by-step solution

For a wave propagating along the X-axis, the direction of propagation is parallel to the X-axis. Wavefronts are defined as the locus of all points having the same phase of oscillation. For a plane wave traveling in the X-direction, the wavefronts are planes perpendicular to the direction of propagation. A plane perpendicular to the X-axis is parallel to the Y-Z plane and has the equation x = constant . Therefore, the equation x = c represents the wavefronts of the light waves.

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