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In an experiment for determination of refractive index of glass of a prism by i – δ , plot, it was found that a ray incident at angle 35º, suffers a deviation of 40º and that it emerges at angle 79º. In that case which of the following is closest to the maximum possible value of the refractive index ?

1. 1.5
2. 1.6
3. 1.7
4. 1.8

Correct answer: 1.5

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