# A light wave travels from air into a medium of refractive index 1.54. If...

Question 472
A
$$2.5\times10^{-7}$$m
B
$$3.8\times10^{-7}$$m
C
$$4.6\times10^{-7}$$m
D
$$5.2\times10^{-7}$$m
E
$$6.1\times10^{-7}$$m
##### Explanation
n =$$\frac{wavelength\, in\, air}{wavelength\, in \,medium}= \frac{5.9\times10^{-7}}{1.54}= 3.8\times10^{-7}$$m

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