For the following questions answer them individually
The refractive index of second medium with respect to the first medium $$n_{21}$$ is given by which formula?
In this question, two statements are given followed by two conclusions. Choose the conclusion(s) which best fit(s) logically.
Statements:
1) All students are girls.
2) No girl is beautiful.
Conclusions:
I. Some students are beautiful.
II. No student is beautiful.
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