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The relationship between distance of the object (u), distance of the image (v) and focal length (f) of the lens is called lens formula or lens equation.
 -------- Lens formula
This lens formula is applicable to both convex and concave lenses.
| Points to be remembered while using the lens formula.
The values of the known parameters should be used with their proper sign as per the sign convention.
No sign should be assigned to the unknown parameter during calculations.
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