An object when placed in front of a convex lens forms a real image of 0.5 megnigacation. If the distance of the frome the lens is 24 cm . calculate the focal length of the lens.
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v=0.5
u=-24cm
f=?
1/u-1/v=1/f
1/-24-1/0.5=1/f
1/-24-10/5=1/f
5/120+240/120=1/f
245/120=1/f
29/14=1/f
f=14/29
f=0.49cm
u=-24cm
f=?
1/u-1/v=1/f
1/-24-1/0.5=1/f
1/-24-10/5=1/f
5/120+240/120=1/f
245/120=1/f
29/14=1/f
f=14/29
f=0.49cm
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