what is the formula to find object distance
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There is a relation connecting object distance (u),image distance (v) and the focal length (f) of a lens. v=uf/(u-f) So if you know the other two variables, v can be found out. If the object is at infinity ( far away from the lens) then v=f.
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Answer:
mirror : 1/f = 1/v + 1/u
lens : 1/f = 1/v - 1/u
Explanation:
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