Retain my current
give the derivation of lens maker formula
do you want the whole derivation or just the expression?
hey give the whole derivation?
hey, d whole derivtion is in lesson 4.......see carefully.......
Aastha Khokhar(student)on 16/10/10
Mausam Anand(student)on 11/11/10
Aastha Khokhar(student)on 29/12/10
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