Angle of refraction : প্রতিসরণ-কোণ;
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Appropriate Prepositions
Zeal for (উৎসাহ): Forhad has great zeal for cricket.
Ashamed of(লজ্জিত): Nandini was ashamed of his wrong-doing.
Consolidate for (শক্তিশালী করা): The four new companies consolidated for greater efficiency.
Effect of (প্রভাব): The effect of corruption is very harmful for our society.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Crying need (জরুরী): Mass education is a crying need for India.
Run high (বেড়ে যাওয়া) —The price of everything has run high.
Set free (মুক্ত করা): The prisoners were set free.
Short cut (সংক্ষিপ্ত পথ)— He comes by this shortcut.