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एक समबाहु प्रिज्म द्वारा उतपन्न अल्पतम विचलन कोण `60^(@)` है। प्रिज्म के पदार्थ का अपवर्तनांक ज्ञात कीजिये।

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प्रश्नानुसार, `A=60^(@)` (चूँकि प्रिज्म समबाहु है।)
`mu=sin((A+deltam)/(2))/(sin((A)/(2)))=sin((60^(@)+60^(@))/(2))/(sin((60^(@))/(2)))`
`=(sin60^(@))/(sin30^(@))=(sqrt(3)//2)/(1//2)=sqrt(3)`

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