An object placed 60 cm away from a lens a real is obtained 30 cm away from the lens.
what is the focal length ?
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Here is ur answer
=>Convex lens will always produce a real image
u=-60cm
v=30cm
f=?
Lens formula :1/v+1/u=1/f
=>u+v/vu=1/f
=>vu/u+v=f
Now substitute the values.
30×-60/-60+30=f
-1800/-30=60
=>F=60cm
Hope it helps u
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