Angle of refraction : প্রতিসরণ-কোণ;
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Appropriate Prepositions
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Catch at(ধরা): A drowning man catches at a straw.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Deprived of (বঞ্চিত): He was deprived of education due to extreme poverty.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
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Idioms
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Hush money (ঘুষ): He offered a hush money to disclose the file.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.