Jawaban:

An optical instrument that uses two convex lenses, in which the objective lens has a shorter focal length than the ocular lens, serves as an enlarging instrument. This type of instrument is commonly known as a compound microscope.

In a compound microscope, the objective lens, which is closest to the object, has a shorter focal length and a wider field of view, allowing it to gather more light and produce a larger, clearer image of the specimen. The ocular lens, which is closer to the observer's eye, has a longer focal length and magnifies the image produced by the objective lens, providing an enlarged view of the specimen.

The combination of the two lenses allows the microscope to produce a highly magnified, clear image of the specimen, making it a valuable tool in many fields, including biology, medicine, and material science.