What is the index of refraction of this substance?

  • #1
The speed of light in a certain substance is 79.0% of its value in water.
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.
 

Answers and Replies

  • #2
Redbelly98
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The speed of light in a certain substance is 79.0% of its value in water.
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.
No, that's n for air.
n for water is ____?
The speed of light in water is ____?
 
  • #3
correction:
n=1.33
and the speed of light in water (3x10^8)/(1.33)=2.25x10^8
 
  • #4
Redbelly98
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That's right. And:
The speed of light in a certain substance is 79.0% of its value in water.
Hope that's enough.
 
  • #5
Since 79%, mulitplying (2.26x10^8)(0.79)= 1.78x10^8.
Correct?
 
  • #6
Redbelly98
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Yes.
 

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