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प्रिज्म के पदार्थ का अपवर्तनांक 1.65 है। यदि यह प्रकाश-किरणों को `7.5^@` के कोण से विचलित करता है, तो प्रिज्म के कोण की गणना कीजिए।

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`delta=(mu-1)A`
दिया है : `mu`=1.65, `delta=7.5^@`
उपर्युक्त सूत्र से , `A=delta/((mu-1))`
मान रखने पर , `A=7.5/(1.65-1)=7.5/0.65 =11.5^@`

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