what is lens formula and mirror formula? please explain

Solution : 

• Mirror formula is a relation between focal length, image distance and object distance of the mirror. According to the formula three are seated as, 
1/f = 1/v + 1/u 

• Lens formula is an expression relating in object distance, image distance and focal length.
According to the formula three are seated as, 
1/f = 1/v - 1/u

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