alleryএটা মাধ্যমৰ প্ৰতিসৰণাংকক এনেদৰে সংজ্ঞায়িত কৰা হয়:
Aমাধ্যমত পোহৰৰ বেগ / শূন্য মাধ্যমত বেগ
Bশূন্য মাধ্যমত পোহৰৰ বেগ / মাধ্যমত বেগ
Cপোহৰৰ বেগ × কম্পনাংক
Dপোহৰৰ বেগ × তৰংগদৈৰ্ঘ্য
Answer & Solution
Correct answer: B. শূন্য মাধ্যমত পোহৰৰ বেগ / মাধ্যমত বেগ
n = শূন্য মাধ্যমত পোহৰৰ বেগ (c) / মাধ্যমত বেগ (v)।
ঘন মাধ্যমত পোহৰৰ গতি লেহেমীয়া হয়, সেয়েহে সদায় n > 1 হয়।
পানীৰ n = 1.33, কাচৰ n = 1.5, হীৰাৰ n = 2.42।
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