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তরঙ্গ দৈর্ঘ্য =1/[R_ (1/2² -1/4² )] = 1/ [ 109678 × 0.1875 ] = 1/ 20564.625 =4.862719354 × 10^-5 cm =4.862719354 × 10^-7 m = 486.27 nm যেহেতু তরঙ্গ দৈর্ঘ্য 450-500 এর মধ্যে , তাই বর্ণ হবে আসমানি
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