the focal length of a concave mirror is 30 cm.what will be the distance of the object in front of the mirror,so that the image is three times the size of the object.
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f = -30 cm
u = ?
m = 3
since ,
m = f / f - u
3 = -30 / -30-u
⇒ u = -20cm
u = ?
m = 3
since ,
m = f / f - u
3 = -30 / -30-u
⇒ u = -20cm
sandeepkumar513:
thanks
:) anytym
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