Worksheet: Coherent Light

In this worksheet, we will practice determining whether two or more electromagnetic waves will interfere to form coherent or incoherent light.

Q1:

Which of the following statements correctly defines what is meant by the term “coherent light”?

  • ATwo or more light waves are coherent if they have the same frequency and a constant phase difference.
  • BTwo or more light waves are coherent if they have the same amplitude and a constant phase difference.
  • CTwo or more light waves are coherent if they have a constant phase difference.
  • DTwo or more light waves are coherent if they have the same frequency and amplitude.
  • ETwo or more light waves are coherent if they have the same frequency.

Q2:

Which of the following statements correctly defines what is meant by incoherent light?

  • ATwo or more light waves are incoherent if they have different frequencies or nonconstant phase differences.
  • BTwo or more light waves are incoherent if they have different amplitudes.
  • CTwo or more light waves are incoherent if they have both different amplitudes and nonconstant phase differences.
  • DTwo or more light waves are incoherent if they have both different frequencies and different amplitudes.
  • ETwo or more light waves are incoherent if they have the same frequency and constant phase differences.

Q3:

In each of the following diagrams, five light waves are shown. Which of the diagrams shows coherent light?

  • A
  • B
  • C
  • D
  • E

Q4:

The figure shows five light waves. Which light wave is not coherent with the other four?

  • Aiii
  • Biv
  • Ci
  • Dv
  • Eii

Q5:

The figure shows five light waves. Which light wave is not coherent with the other four?

  • Aiv
  • Bv
  • Cii
  • Diii
  • Ei

Q6:

In each of the following diagrams, five light waves are shown. Which of the diagrams shows incoherent light?

  • A
  • B
  • C
  • D
  • E

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