Optical glass : আলোকবিদ্যা-সংক্রান্ত;
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Contribution to (অবদান): His invention made a major contribution to road safety.
Easy of (সরল): The teacher is easy of approach.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
Recover from (সুস্থ হওয়া; পূর্ব অবস্থায় ফিরে আসা): The patient has not yet recovered from his severe illness.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
For good (চিরদিনের জন্য): He left the house for good.
Fight shy of (এড়িয়ে যাওয়া): Honest boys always fight shy of bad and dishonest friends.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.