AIIMS 2019 Physics Lens Formula and Magnification MCQ Question

The magnification (m) of a lens is given by the formula $m = -\frac{v}{u}$, where $v$ is the image distance and $u$ is the object distance. Substituting the values, $m = -\frac{-100}{20} = 5$, indicating that the image is inverted and magnified by a factor of 5, hence the negative sign in the magnification formula leads to option B being correct. Other options are incorrect as they do not reflect the correct relationship between the image and object distances, and they fail to account for the inversion of the image produced by a real lens.