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2015-02-10T11:31:22+05:30

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F = -10 cm
m = 4 = -v/u
v = -4u
u = ?
1/f = 1/v + 1/u
-1/10 = -1/4u + 1/u 
on solviing this u can find the value of u, i.e object distance
the ans. is -7.5 c.m
2 5 2
in which standard you are?
im in 10th
and u
9th
okk
2015-02-10T13:01:47+05:30

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