Angle of refraction : প্রতিসরণ-কোণ;
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Appropriate Prepositions
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
Relation with (সম্পর্ক): I have no relation with the culprit.
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Idioms
Beggar description - (অবর্ণনীয় হওয়া): The distress of the Muslims in Bosnia beggars description.
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.