railway RRB Group D Mock Test Series 2024-25 General Science Physics Optics

According to mirror formula, the focal length of a spherical mirror is equal to:

1
\(\frac{u v}{u-v}\)
2
\(\frac{u v}{u+v}\)
3
\(\frac{u-v}{u v}\)
4
\(\frac{u+v}{u v}\)
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