Optical glass : আলোকবিদ্যা-সংক্রান্ত;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Convinced of (আশ্বস্ত): You are convinced of his product.
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
Easy of (সরল): The teacher is easy of approach.
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Idioms
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
In the long run (পরিণামে): You will have to suffer in the long run.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.