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# Measuring the refractive index of a rectangular glass block. (Snell's law)

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1. Does anyone know how to get the gradient after you have drawn up the graph for this experiment, what the gradient represents and the conclusion for this experiment because google is not really helping me right now. Also how would you comment on the error of this experiment?
2. (Original post by Globay)
Does anyone know how to get the gradient after you have drawn up the graph for this experiment, what the gradient represents and the conclusion for this experiment because google is not really helping me right now. Also how would you comment on the error of this experiment?
So you measured the angle of incident vs refraction from air into the glass?

If you think of snell's law then and
so

So if you plot sine of the incident angle vs sine of the refracted angle the gradient will be the refractive index of the glass
3. (Original post by langlitz)
So you measured the angle of incident vs refraction from air into the glass?

If you think of snell's law then and
so

So if you plot sine of the incident angle vs sine of the refracted angle the gradient will be the refractive index of the glass

OMG Thank u so much. U have literally just saved my life.(that might be a bit ott but watevs)
4. (Original post by Globay)
OMG Thank u so much. U have literally just saved my life.(that might be a bit ott but watevs)
You're welcome!! Also, for the errors, think about how accurately you can actually measure the angles realistically...

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