WAEC Physics 2014 Paper

Concept:In a compound microscope, the focal length of the objective lens is shorter than that of the eyepiece.Explanation:The objective lens forms a highly magnified real image of the object.To achieve this, it must have a small focal length $f_{\mathrm{o}}$.The eyepiece then magnifies this image further for clear viewing.So the eyepiece has a larger focal length $f_{\mathrm{e}}$ than the objective.Therefore, the correct relation is $f_{\mathrm{o}} < f_{\mathrm{e}}$.Answer:$f_{\mathrm{o}} < f_{\mathrm{e}}$ (Option B)