Refractive index of different colors

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Homework Help Overview

The discussion revolves around designing an experiment to measure the refractive indices of different colors using a glass block and color filters. Participants are exploring the implications of small variations in refractive index with frequency and how to accurately measure angles of incidence and refraction.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss using a white laser light and color filters to shine light through a glass block, measuring angles with a protractor. There are questions about the adequacy of a protractor for small angle differences and suggestions to consider total internal reflection and the use of a prism instead. Some propose measuring beam positions and applying trigonometry for more accurate results.

Discussion Status

The discussion is active with various approaches being considered, including the use of trigonometry for measuring angles and the practicality of using a rectangular glass block versus a prism. Participants are engaging with the challenges of measuring small angle differences and the implications of the experiment's design.

Contextual Notes

There is an emphasis on the constraints of using a rectangular glass block as specified in the homework, which influences the methods being discussed. Participants are also considering the limitations of measurement tools in the context of small angle differences.

MrEinstein
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Homework Statement



I have to design an experiment to determine the difference in refractive indices for different colors.

Assume you have : color filters,glass block



Homework Equations





The Attempt at a Solution



I want to do it buy shining a white laser light through filters into the glass block and measuring the angle of incidence and refraction using a protractor. But they say to take into account the fact that the variation of refractive index with frequency is very small. So what else can I do to take that into account?
 
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Total reflection might be interesting to study, as it is quite sensitive to small angle differences.
A prism would be easier, of course.
 
But what exactly do we use to measure the angle of refraction? It's going to be such a small angle difference that a protractor can't help. Yeah,with a prism it would be easy but they say that you have a rectangular glass block so they clearly want you to use it.
 
Measure the position of the beam at different points and use trigonometry? If you just need the difference and not an absolute value, it is easier.
 
Ahhh trigs. Length can be measured more accurately than angles. This explains the glass block, instant right angled triangle.
Thank you man
 

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