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For a light wave a certaon frequency, the difference in wavelength in alcohol (R.I = 1.35) and glass (R.I. = 1.5) is 400 Å. Wavelength of light in vacuum is

A

3400 Å

B

5400 Å

C

6400 Å

D

4400 Å

Text Solution

Verified by Experts

The correct Answer is:
B
`lambda_(a1) - lambda_(g) = (lambda_(a))/(mu_(a1)) - (lambda_(g))/(mu_(g)) = lambda_(a)[(1)/(mu_(a1))-(1)/(mu_(g))]`
`400 = lambda_(a) [(1)/(1.35)-(1)/(1.5)]`
`:. lambda_(a) = 5400 Å`
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