What stays constant when light refracts
When light passes from air into water, which property stays the same?
Answer B: explanation for every choice
A
Light slows in water: v = c/n.
B
Correct. Frequency is set by the source and does not change at a boundary.
C
Since v = fλ and f is constant, the wavelength shortens.
D
Light bends at the boundary unless it strikes along the normal.
TakeawayFrequency is fixed by the source. Speed and wavelength change with the medium.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID cp33.