Refractive index : প্রতিসরাঙ্ক;
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Appropriate Prepositions
Dependent on (নির্ভরশীল): Sepm is dependent on his father.
Identical with (একই ধরণের): You are identical with your sister.
Object to (প্রতিবাদ করা): Many people objected to the remarks of the leader.
Quarrel with (ঝগড়া করা): Some girls quarreled with one another.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
In no time (শীঘ্র): He will finish the work in no time.
Three score (ষাট): He is happy as his brother got three score.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.