Find the focal lenght of a concave mirror when the image distance is 20 m nd object distance is 1000 cm.
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Answer:
u=-20m
v=-100m
f=?
by mirror formula
1/f=1/v+1/u
1/f=-1/100-1/20
1/f=-1-5/100
1/f=-6/100
f=100/-6
f=-16.6m
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Explanation:
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