A concave mirror of focal length 20cm forms a sharp image magnified three times on a screen.What is the distance of the object from the mirror.
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pls answer yar
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we have magnification=-3
-v/u=-3
v=3u
using mirror formula
1/-20=1/3u+1/u
1/-20=4/3u
u=-80/3
-v/u=-3
v=3u
using mirror formula
1/-20=1/3u+1/u
1/-20=4/3u
u=-80/3
thxs pls answer my next question also
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