# What is the speed of light in a diamond

#### jlmac2001

I have a couple of questions that I need help with. I tried doing the first one but don't know if it is correct. Should the second one be done the same as the first?

1. What is the speed of light in diamond if the index of refraction is 2.42? n=c/v v=3*10^8/2.42 = 1.23*10^8 m/s

2.Given that the wavelength of a lightwave in vaccum is 540nm. What will it be in water, where n=1.33?

ans. Would i do it like the first?

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#### Chiara

yes, u would do the same thing
n= c/v= fw/fY where f is the frequency of light, that obviously remains constant independently from the medium, w is the wavelength of light in the vacuum and y is the frequency of light in water.Simplifying you get n=w/Y

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