CBSE Class 10 Science 2015 Term II Delhi Set 1

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Question : 32
Total: 36
Four students P,Q,R and S traced the path of a ray of light passing through a glass slab for an angle of incidence 40 and measured the angle of refraction. The values as measured them were 18;22;25 and 30 respectively. The student who has performed the experiment methodically is
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