Ei numerical gulo solve korle sir bole "sign convention mone rakho, formula lagao", kintu ami khali dekhchhi rickshawalader concave rearview mirror-e pichhone koto ta jayga ache. Object pole ar focus-er modhye thakle mirror-e boro, upright image hoy – etai formula diye likhe dei, but real life-e shei image ta dekhlei bujhi danger ase pichhon theke. Coaching centre-er kota te boshe formula ratar chheye rickshawala bhai-r bike-er mirror dekhe optics bujhlam.
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