Angle of refraction : প্রতিসরণ-কোণ;
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Appropriate Prepositions
Entitled to (অধিকারী): He is entitled to a reward for honesty.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Infested with (অতিষ্ঠ): The room is infested with rats.
Object to (আপত্তি করা): He objected to my proposal.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Breathe one’s last (decease, die- শেষ নিঃশেষ ত্যাগ করা, মরে যাওয়া) The man breathed his last in his native village.
Milk and honey – (প্রাচুর্য)- He lives with milk and honey.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.