Let's solve some problems to better understand how compound microscopes and telescopes work. We will understand the purpose of each lens in these optical instruments. Compound microscope and telescope - qualitative Get 3 of 4 questions to level up! This Compound Microscope and Case are featured in the exhibition “Magnified Wonders: An 18th-Century Microscope ,” part of the larger initiative “PST ART: Art & Science Collide.” An object containing a fingerprint is kept 1.8 cm from the objective (f o = 1.4 cm) of a compound microscope . The fingerprint is observed to be magnified 30 times.