Angle of refraction : প্রতিসরণ-কোণ;
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Appropriate Prepositions
Associate with, in(জড়িত হওয়া): This man was associated with crime.
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Informed of (অবহিত): I was not informed of your misfortune.
Long for (আশা করা/কামনা করা): He longed for name and fame.
Suffer from (অসুখে ভোগা, কষ্ট পাওয়া): He has been suffering from fever for last three days.
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Idioms
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Pin money (স্ত্রীর দেয়া হাত খরচ)— She saved her pin money.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.