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Weifang Sanmao Mathematics Answer 20 17
Solution: ① The optical path is as shown in the figure, and the total reflection occurs at point n, ∠ Mo ′ n = 30, and the critical angle C = 30 due to the geometric relationship.

From the law of refraction: sinc =1n.

de:n = 1 sinc = 1 sin 30 = 2。

(2) Let the distance between o and m be d, and the geometric relation sinc = dr.

D=R2

A:

① The refractive index of glass is 2;

② The distance between o ′ m is R2.