Angle of refraction : প্রতিসরণ-কোণ;
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Appropriate Prepositions
Competent for(যোগ্য): He is not competent for the post.
Consolidate for (শক্তিশালী করা): The four new companies consolidated for greater efficiency.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Dwell in (বাস করা): He dwells in a tall apartment.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
Breathe one’s last (decease, die- শেষ নিঃশেষ ত্যাগ করা, মরে যাওয়া) The man breathed his last in his native village.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
Set free (মুক্ত করা): The prisoners were set free.
Up to (পর্যন্ত) - I have done the exercises up to page 40.