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①n=sin90 sin45 =2？
② The light path is shown on the right.
n=sinrsin30 =2
r=45
I′= 30
The distance between two light spots S 1 and S2 is:
L = rtan45+rtan60 = (10+103) cm.
Answer: ① The refractive index n of glass brick is 2;
② When the rotation angle is 30, the distance between two light spots on the screen is l = (10+ 103) cm.
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