Which of the following is the mirror formula? (u = object distance, v = image distance, f = focal length.)
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)
For a spherical mirror the object distance, the image distance and the focal length are related by the mirror formula \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\). The form with a minus sign, \(\frac{1}{v}-\frac{1}{u}=\frac{1}{f}\), is the lens formula.