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एक समबाहु प्रिज्म अल्पतम विचलन कि स्थति में है। यदि आपतन कोण प्रिज्म-कोण `4/5` गुना हो,तो अल्पतम विचलन का कोण होगा,
A. `72^(@)`
B. `60^(@)`
C. `48^(@)`
D. `36^(@).`

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Correct Answer - D
`delta_(m)=2i-A=2xx4/5A-A`
`=3/5A=3/5xx60^(@)=36^(@).`

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