Final answer:
The condenser lens is the option that is not a magnifying lens. It is used to focus and condense light onto the specimen, while the other options are designed for magnification purposes such as the oil immersion, ocular, and high power lenses.
Step-by-step explanation:
The question asks which lens is not a magnifying lens, given a selection of lenses that are typically found in microscopes. The correct answer is C, the condenser lens. The condenser lens is not designed to magnify the specimen; instead, its purpose is to focus and condense the light onto the specimen. It works by gathering light from the microscope's light source and directing it onto the slide being viewed. In contrast, the oil immersion lens, ocular lens, and high power lens are all designed to magnify the image of the specimen. The oil immersion lens, in particular, is used with immersion oil to reduce the refraction of light, which enhances resolution at high magnifications. The ocular lens, also known as the eyepiece, magnifies the image produced by the objective lens, and the high power lens is one of the objective lenses that provides a greater magnification than lower power objective lenses.