Wavefront : যে তল বা পৃষ্ঠের অনেকগুলি বিন্দু একট নির্দিষ্ট সময়ে একটি তরঙ্গের দ্বারা সমানভাবে প্রভাবিত হয়;
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Appropriate Prepositions
Agree with, on, to(একমত হওয়া): My father agreed with me on this point, but he did not agree to my proposal to set up a canteen.
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Devoted to (মনোযোগী): He is devoted to music.
Informed of (অবহিত): I was not informed of your misfortune.
Sorry for (দুঃখিত): He is sorry for his misdeeds.
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Idioms
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.