at what distance should an object be placed from a convex lens of focal length 18 cm to obtain an image at 24 cm from it on the other side what will be the magnification produced in this case
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f= 18
v=24
u=?
use lens formula
1/u-1/v=1/f
1/u=1/f-1/v
1/u=1/18-1/24
take L.C.M
1/u=4-3/72
1/u=1/72
u=72
magnification method
m=-u/v
m=-72/24
m=-3
v=24
u=?
use lens formula
1/u-1/v=1/f
1/u=1/f-1/v
1/u=1/18-1/24
take L.C.M
1/u=4-3/72
1/u=1/72
u=72
magnification method
m=-u/v
m=-72/24
m=-3
Dhruv1011:
sorry it is locking wrong. (u) cannot be positive. It is always in negative.
And thank you for your efforts
your u is come on -72 because in convex lens v, f, are -ve
then, m=3
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