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অপবর্তন গ্রেটিং এ চরমের শর্ত হলো-

d \sin θ_{n} = (n + 1) λ

d \sin θ_{n} = n \frac{λ}{2}

d \sin θ_{n} = (2 n + 1) \frac{λ}{2}

(a + b) \sin θ_{n} = n λ

ANS : 4

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