Physicshard · Past Paper
The speed of light in a vacuum is c. If it enters a medium of RI 'n', its wavelength changes to:
Anλ
Bλ/n
Cλ
Dλ/n^2
✓ Correct Answer: B — λ/n
Since frequency is constant, λ_new = v/f = (c/n)/f = λ_old/n.
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