find the image distance, when an object is kept 60cm. from the pole of a concave mirror having 20cm. focal length
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nikhil6029:
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u=-60
f=-20
1/v+1/u=1/f
1/v=-1/3
v=-3
f=-20
1/v+1/u=1/f
1/v=-1/3
v=-3
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