a convex lens produces an inverted image magnified 3 times of an object placed at a distance of 15 cm from it .calculate focal length of lens
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let O is x
and the I will be 3 x
and u = -15
as m= v/u= I/O
OK put all values and after that apply formulae
1/f= 1/v-1/u
and the I will be 3 x
and u = -15
as m= v/u= I/O
OK put all values and after that apply formulae
1/f= 1/v-1/u
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