अगर प्रकाश का आपतन-कोण 90° है और अपवर्तन के बाद कोण 30° है तो माध्यम का अपवर्तनीय सूचक है। – Agar Prakash Ka Aapatan kon 90° Hai Aur Apvartan Ke Bad Kon 30° Hai To Madhyam Ka Apvartani Suchak Hai
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