THE DERIVATIONS WHICH ARE NOT GIVEN IN PHYSICS TEXTBOOK-12TH WILLALSO BE ASKED?
OR WE SHOULD LEARN THE FORMULAS ONLY FOR THOSE DERIVATIONS. FOR EX.IN TEXTBOOK ONLY MAGNIFYING POWER'S FORMULA IS MENTIONED BUT IT'S DERIVATION IS NOT GIVEN.WHEREAS IN ABC REFRESHERS IN IS SOLVED FULLY.
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