NDA 2021 Physics question

According to the New Cartesian Sign Convention, which one of the following is correct in respect of the formula , where symbols have their usual meanings ?

(A)It applies only to spherical mirrors.Correct
(B)It applies only to spherical lenses.
(C)It applies to spherical mirrors as well as spherical lenses.
(D)It is an invalid formula.

Answer: (A)

Solution

With the New Cartesian Sign Convention, is the mirror formula and

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Question ID VK-031759