According to the New Cartesian Sign Convention, which one of the following is correct in respect of the formula $\frac{1}{f} = \frac{1}{v} + \frac{1}{u}$, where symbols have their usual meanings?
It applies only to spherical mirrors.
It applies only to spherical lenses.
It applies to spherical mirrors as well as spherical lenses.
It is an invalid formula.
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC NDA-1 – 2021