28. When a beam of light (a = 6000 Å) travelling in air enters a
glass medium (u = 1.5), the wavelength of light in glass,
would be
(a) 2000 Å (b) 3000 Å (c) 4000 Å (d) 5000 Å
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Explanation:
u=wavelength of air/wavelength of ice
u=6000/i
i=6000/1.5
wavelength is 4000A
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