Which Medium Has a Lower Index of Refraction: C or D?

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When light travels from medium C to medium D, the angle of incidence exceeds the angle of refraction, indicating that medium C has a higher index of refraction than medium D. According to Snell's law, the medium with the lower index of refraction allows light to travel faster. Therefore, medium D must have the lower index of refraction. The discussion emphasizes understanding the principles of refraction rather than simply providing answers. This highlights the importance of grasping the underlying concepts in optics.
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Light travels from medium C to medium D. The angle of incidence is larger than the angle of refraction. Which medium has the lower index of refraction? Explain your logic.
 
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We don't spoon feed here. Show your effort.
 
I'll spoon feed you a hint. Study Snell's law.
 
oh~~~~~ i got it thank you very much
 
I got this answer: Fast medium will have smaller index of refraction because you can't refract the light by more than 90 degrees.
 
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