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)which rule do we have to follow while finding magnification?
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Explanation:
Magnification (m) = h/h’
And h’ is the image height and h is the object height.
Magnification can also be related to the image distance and object distance; therefore it can also be written as:
m = -v/u
Where v is the image distance and u is the object distance.
Hence, the expression for magnification (m) becomes:
m = h’/h = -v/u
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