Hallo,
hier eine Physikaufgabe in englisch:
"In optics, the index of refraction of a liquid is defined as where i is the angle at wich the light is incident on the liquid from the air, and r is the angle of the refracted light in the liquid.
If the angle of incidence is increasing at the rate of 0,05 rad/min., what is the rate of change of the angle r when i = 10° for benzene, for wich n is 150.
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MfG
usmi