Discussion
When a ray of light moves from one medium to another medium,
Answer: A
Its frequency remains unchanged.
Frequency is fixed by the source: the waves arriving at the boundary must match the oscillations they set up on the other side, so the number of waves per second cannot change. The speed changes to \(v = \frac{c}{n}\), and since \(v = f\lambda\), the wavelength changes in proportion.
So options saying the frequency changes, the wavelength stays the same, or the velocity stays constant are all wrong.
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