Imagine a classmate of yours, Jennifer, is having trouble se…

Imagine a classmate of yours, Jennifer, is having trouble seeing her specimen on the microscope at higher magnifications. Jennifer is able to see the specimen at 4x moderately, but barely at 10x, and not at all while using the 40x objective lens. Jennifer keeps saying the image is very dim while using the higher magnification objective lenses. Which of the following pieces of advice would be best to help your classmate find the specimen in her microscope?