Refractive index : প্রতিসরাঙ্ক;
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Appropriate Prepositions
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Careful of (সতর্ক): He is very careful of his fault.
Desist from (বিরত থাকা): She desisted from making this.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
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Idioms
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.