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in Physics by (25.3k points)
किसी सधन माध्यम में क्रांतिक कोण वयक्त होता है:
`i_(c) = tan^(-1)(5/7)`
सधन माध्यम का अपवर्तनांक विरल माध्यम के सापेक्ष है:
A. `1.4`
B. `1.6`
C. `sqrt(74)//5`
D. `sqrt(74)//7`

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