Angle of refraction : প্রতিসরণ-কোণ;
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Appropriate Prepositions
Argue over (কোন বিষয়ে তর্ক করা): The kids are arguing over which TV program to watch.
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Make of (কোনো উপকরণ দ্বারা সরাসরি তৈরী বোঝাতে): This necklace is made of gold.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?