Optical glass : আলোকবিদ্যা-সংক্রান্ত;
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Appropriate Prepositions
Arrive at(উপস্থিত হওয়া, পৌছানো): The train arrived at Dhaka station on time.
Aware of(অবগত): I am not aware of his dishonesty.
Die of, for, from (মারা যাওয়া): He died of cholera. He died for his country. He died from an injury.
Dull of (বধির; কানে শুনে না): He is dull of hearing.
Greed for (লোভ): He has an indomitable greed for wealth.
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Idioms
Be all and end all (the ultimate out come- চরম পরিণতি—n) A loss of one million taka was the be all and end all of the projects.
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.