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.
3instein
Messages
2
Reaction score
0

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

?
 
Physics news on Phys.org
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!
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Back
Top