Formula for focal length of a lens is 1/v + 1/u= 1/f
Find f, if u = 27cm , v= 30 cm
Just substitute in for u and v, and then solve for f.
1/v + 1/u = 1/f 1/30 + 1/27 = 1/f {substituted 30 for v and 27 for u} â9/270 + 10/270 = 1/f {changed fractions on left side to have a common denominator of 270} 19/270 = 1/f {on left side, combined numerators over common denominator} f = 270/19 {flipped both sides to solve for f} âAsk Algebra House
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