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For a ray refracted through a prism of angle A, the internal refraction angles r1 and r2 satisfy
Ar1 + r2 = 2A
Br1 + r2 = A
Cr1 minus r2 = A
Dr1 + r2 = 90°
Answer & Solution
Correct answer: B. r1 + r2 = A
Geometry of the quadrilateral formed at the two faces gives r1 + r2 = A.
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