The speed of light in a certain substance is 79.0% of its value in water.(adsbygoogle = window.adsbygoogle || []).push({});

What is the index of refraction of this substance?

Here's what I've done so far:

(3.0*10^8 m/s)(0.79) because its 79%.

In water, the n=1.003.

I'm not sure where to go from there.

Any help would be greatly appreciated!

Thanks in advance.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: What is the index of refraction of this substance?

**Physics Forums | Science Articles, Homework Help, Discussion**