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After tracing the path of a ray of light passing through a rectangular glass slab for four different values of the angle of incidence, a student reported

his observations in tabular form as given below: S.No. ∠i ∠r ∠e I 30° 19° 29° II 40° 28° 40° III 50° 36° 50° IV 60° 40° 59° The best observation is (A) I (B) II (C) III (D) IV


The best observation is (A)I
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