Extinction angle : কুণ্ঠন কোণ; লোপ-কোণ;
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Appropriate Prepositions
Adjacent to(সংলগ্ন): The Post Office is adjacent to my house.
Angry for (কোন কাজে রাগান্বিত হওয়া): Rahim was angry with me for my having done this.
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Object to (প্রতিবাদ করা): Many people objected to the remarks of the leader.
Sorry for (দুঃখিত): He is sorry for his misdeeds.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Short temper (রগচটা)— He is a man of short temper.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.