Three right angled prisms of refractive indices μ1, μ2 and μ3 are joined together ao that the faces of the middle prism are each in contact with one of the outside prisms. If the ray passes through the composite block undeviated, then
A
1+μ22=μ21+μ23
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B
μ12−μ32+μ23=1
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C
μ12−μ32−μ23=1
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D
μ22+μ33−μ21=1
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