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in Physics by (25.0k points)
किसी सघन माध्यम में क्रान्तिक कोण निम्न से व्यक्त होता है-
`i_(c)=tan^(-1)((5)/(7))`
सधन माध्यम का अपवर्तनांक विरल माध्यम के सापेक्ष है-
A. `1.4,`
B. `1.6,`
C. `(sqrt74)/(6),`
D. `(sqrt74)/(4).`

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