an object is placed at a distance of 30 cm from a concave lens of focal length 15 cm list four characteristics of the image formed by the lens.
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1/f=1/u+1/v
1/15=-1/30+1/v
1/15+1/30=1/v
2+1/30=1/v
1/10=1/v
v=10cm
1/15=-1/30+1/v
1/15+1/30=1/v
2+1/30=1/v
1/10=1/v
v=10cm
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