a concave mirror of focal length 20cm is placed at a distance of 50cm from the wall how far from the wall should an object be placed to form it's real image on the wall
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according to the question, f = -20cm
v =50cm.
u = ?
using mirror formula,
1/v +1/u =1/f
1/50 + 1/u = 1/-20
1/u =1/-20 -1/50
1/u = -5 -/ 100
u = - 100/7
u~ 14.2
v =50cm.
u = ?
using mirror formula,
1/v +1/u =1/f
1/50 + 1/u = 1/-20
1/u =1/-20 -1/50
1/u = -5 -/ 100
u = - 100/7
u~ 14.2
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