# This problem is a combination of optics and derivatives

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## Homework Statement:

r is the angle of incidence, i is the angle of refraction. Denote the derivative dr / di as a function containing only the refractive index n and sinusoidal sini

## Relevant Equations:

sini/sinr=n
According to Cartesian second law, we can get this formula. but wo don't know how to do next. because we just know the sinr and sini.

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