Angle of refraction : প্রতিসরণ-কোণ;
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Appropriate Prepositions
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Devoted to (মনোযোগী): He is devoted to music.
Die of (রোগে মরা): Many people died of cholera.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.
Set out (যাত্রা করা)— I will set out in time.