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Glass has n = 1.5 and water has n = 4/3, both relative to air. The index of glass relative to water is:
A8/9
B2
C9/8
D1/2
Answer & Solution
Correct answer: C. 9/8
n(glass,water) = n(glass,air) / n(water,air) = 1.5 / (4/3) = 9/8.
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