किस माध्यम का निरपेक्ष अपवर्तनांक न्यूनतम है? (A) निर्वात् (B) वायु (C) जल (D) काँच
किस माध्यम का निरपेक्ष अपवर्तनांक न्यूनतम है?
(A) निर्वात्
(B) वायु
(C) जल
(D) काँच
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