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Question

কাঁচের প্রতিসরাঙ্ক 1.45 হলে কাচের ভেতর আলোর গতিবেগ কত?

1.45 × 10⁸ m/s

2.06. × 10⁸ m/s

3.00 × 10⁸ m/s

4.35 × 10⁸ m/s

ANS : 2

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