A student focuses the low power of the microscope and observes a dark object. When she moves the slide to the left and toward herself the object remains in the same position.When she switches to high power, the same spot appears.What is the explanation?

A microscope is a laboratory instrument used to examine objects that are too small to be seen by the naked eye.
Microscopy is the science of investigating small objects and structures using a microscope.
Microscopic means being invisible to the eye unless aided by a microscope.