The magnification (m) and focal length (f) of a plane mirror are

$\text{m = +1; f = ∞}$

The correct answer is Option (2) → $\text{m = +1; f = ∞}$

For a plane mirror:

- Image is virtual, upright, and of the same size as the object.

Linear magnification:

$m = \frac{\text{image height}}{\text{object height}} = 1$

Focal length of a plane mirror:

$f = \infty$

Final Answer: $m = 1$, $f = \infty$