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আলো যখন বাতাস থেকে কাচে প্রবেশ করে তখন তার
কম্পন বৃদ্ধি পায়
কম্পন হ্রাস পায়
তরঙ্গদৈর্ঘ্য বৃদ্ধি পায়
তরঙ্গদের্ঘ্য হ্রাস পায়
ANSWER : 4
Descrption
<p>আলোকরশ্মি যখন লঘু মাধ্যম (যেমন বায়ু) থেকে ঘন মাধ্যমে (যেমন কাঁচ) প্রবেশ করে, তখন প্রতিসৃত রশ্মী অভিলম্বের দিকে সরে আসে। তাই এক্ষেত্রে প্রতিসরণ কোণের মান আপাতন কোণের মানের চেয়ে কম হয়। এক্ষেত্রে আপতন কোণ i প্রতিসরণ কোণ r এর চেয়ে বড় হয় অর্থাৎ i>r হবে।</p><p> </p><figure class="image image_resized" style="width:69.81%;"><img src="data:image/png;base64,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"></figure>
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