Multiple choice

A ray is entering from one medium to another medium. Which of the following statements is true in this context?

  1. Frequency of rays doesn't change, but its wavelength changes.

  2. Frequency of rays changes, but its wavelength doesn't change.

  3. Phase and velocity of ray change but its wavelength doesn't change

  4. Phase and velocity of rays doesn't change, but its wavelength changes.

  5. Frequency, phase, velocity and wavelength; all change.
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A Correct answer
Explanation

Frequency doesn't change, but the wavelength changes.

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