an object when viewed through a concave mirror forms an image which is double the size of the object. Calculate the possible object distance given that the focal length of the mirror is 20cm.
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m=-v/u
2=-v/u
v=-2u
1/-2u+1/u=1/f
u=f/2=10
2=-v/u
v=-2u
1/-2u+1/u=1/f
u=f/2=10
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