Simple Microscope
An optical magnifying instrument consisting of a single converging biconvex lens used to produce an enlarged, upright, virtual image.
Governing formula
M = 1 + (D / f) (Image at near point D)
SI unit
Dimensionless (×)
In depth
The object is placed within the lens's focal length ($u < f$). The lens creates a magnified virtual image at the eye's near point $D = 25 cm$.
Examples in the real world
Jewelers and watchmakers using a handheld jeweler's loupe to inspect gemstone facets and tiny gears.