Final answer:
When using a microscope that is not parfocal, switching from the lowest power to the medium power objective would result in the specimen appearing out of focus and requiring significant adjustment to regain focus.
Step-by-step explanation:
When using a microscope that is not parfocal, switching from the lowest power to the medium power objective would result in the specimen appearing out of focus and requiring significant adjustment to regain focus. In a parfocal microscope, the objective lenses are designed to maintain focus when switching between them. However, if the microscope is not parfocal, the working distance and focal point of the medium power objective would be different from the lowest power objective, leading to a blurry and misaligned image.