Monochromatic light is refracted from air into a medium of refracti...

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Monochromatic light is refracted from air into a medium of refractive index \( n \). The ratio of the
\( \mathrm{P} \)
wavelength of the incident and the refracted waves
W
is:
(1) \( 1: 1 \)
(2) \( 1: n \)
(3) \( n: 1 \)
(4) \( n^{2}: 1 \)
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