a convex lens have focal length 30cm at what distance the object must be placed to form an image at 60cm. find the magnification
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Focal length=30 cm (+)
v=60cm (-)
we know
1/f=1/v-1/u
1/u=1/v-1/f
1/u= 1/-60 - 1/30
1/u= -1-3/60
1/u=-4/60
1/u= -1/15
u=-15 cm
Linear magnification
m=I/O=v/u
m=-60/-15
m=4
v=60cm (-)
we know
1/f=1/v-1/u
1/u=1/v-1/f
1/u= 1/-60 - 1/30
1/u= -1-3/60
1/u=-4/60
1/u= -1/15
u=-15 cm
Linear magnification
m=I/O=v/u
m=-60/-15
m=4
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