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एक प्रिज्म का अपवर्तक कोण `60^@` है। यदि न्यूनतम विचलन का कोण `38^@` हो, तो प्रिज्म के पदार्थ का अपवर्तनांक ज्ञात कीजिए। (sin `49^@` = 0.7547)

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सूत्र - `mu=("sin" (A+delta_m)/2)/("sin" A/2)`
दिया है - A = `60^@` तथा `delta_m=38^@`
सूत्र में मान रखने पर, `mu=(sin((60^@+38^@)/2))/(sin(60^@/2))`
`=(sin 49^@)/(sin 30^@)=0.7547/0.5000`
=1.5094

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