Question

What is Compound Microscope?

Answer

Compound Microscope is a simple microscope has a limited maximum magnification (≤9) for realistic focal lengths. For much larger magnifications, one uses two lenses, one compounding the effect of the other. The lens nearest the object, called the objective, forms a real, inverted, magnified image of the object. This serves as the object for the second lens, the eyepiece, which functions essentially like a simple microscope or magnifier, produces the final image, which is enlarged and virtual. The first inverted image is thus near (at or within) the focal plane of the eyepiece, at a distance appropriate for final image formation at infinity, or a little closer for image formation at the near point. Clearly, the final image is inverted with respect to the original object.