Refractive index and speed of light

AI Thread Summary
To find the speed of light in a slab of glass with a refractive index of 1.3, the correct formula to use is the relationship between the speed of light in a medium and its refractive index, given by the equation: speed of light in the medium = c/n. The initial attempt to use the sine equation was incorrect as it pertains to angles rather than refractive indices. The discussion emphasizes providing hints rather than direct answers for homework questions. Overall, the focus is on applying the correct physics principles to solve the problem effectively.
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Homework Statement



A slab of glass has a refractive index of 1.3. What will be the speed of light in this glass?

Homework Equations





The Attempt at a Solution



\frac{sin i}{sin r}=1.3

?
 
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Wrong equation. If you knew what this equation was, youwould know that you can't use it. The "i" and "r" are referring to angles, and are any angles given?

Try the equation that defines the index of refraction, n .
 
light speed in the media = c/n
 
Welcome to Physics Forums scivet!

We try to give hints to people, rather than giving the answer, when it's a homework question.

But since the question is from last semester, no harm done!
 

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