Light of 700 nm wavelength travels in a medium with an index of refraction of 1.

Question

Light of 700 nm wavelength travels in a medium with an index of refraction of 1.4. Its frequency in vacuum is A. increased by a factor of 1.96. B. increased by a factor of 1.4. C. unchanged. D. decreased by a factor of 1.96. E. decreased by a factor of 1.4. Light of 700 nm wavelength travels in a medium with an index of refraction of 1.4. Its wavelength in vacuum is A. increased by a factor of 1.96. B. increased by a factor of 1.4. C. unchanged. D. decreased by a factor of 1.96. E. decreased by a factor of 1.4.

Explanation / Answer

part a )

frequancy remains unchanged (c option )

part b )

lambda = c/f

frequency remains unchanged when it goes from one medium to another medium

c = c/n

lambda' = lambda/n

decreased by factor 1.4 (E option )

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