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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.