Angle of refraction : প্রতিসরণ-কোণ;
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Long for (আশা করা/কামনা করা): He longed for name and fame.
Loyal to (অনুগত): Every citizen must be loyal to the state.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
Fair and square (সৎ): The learned persons should be fair and square.
Null and void (বাতিল): The deed has been null and void now.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
Three score (ষাট): He is happy as his brother got three score.
Worthy of (যোগ্য) - He is worthy of a good job.