50 free Microscopes trivia questions with answers — technology quiz, new questions added Aug 2026.
Microscopes trivia spans four centuries of looking at very small things. Nobody knows who built the first compound microscope, though a Dutch counterfeiter's son claimed his father did; Galileo called his an 'occhiolino'; Robert Hooke's Micrographia became the first scientific bestseller and gave biology the word 'cell'; and a Delft cloth merchant with a bead of glass in a brass plate saw bacteria before anyone else and wrote to the Royal Society about them, in Dutch, for fifty years. This quiz covers that history and then the machines: the eyepiece, objective, stage and condenser of a light microscope, Köhler illumination and oil immersion, Ernst Abbe's diffraction limit and the Zeiss works, phase contrast, confocal and fluorescence microscopy, the electron microscope Ruska built in 1931, the scanning tunneling and atomic force microscopes that let researchers push individual atoms around, and the 2014 Nobel Prize for beating the diffraction limit. Easy questions suit anyone who used a microscope in school; the expert tier is for lab rats and history-of-science fans. Every answer was checked against Wikipedia's articles on microscopes and their inventors, and the supporting sentence is attached to each question.
30 of 50 questions with answers and explanations. Play the quiz
Q 01What is a microscope used to examine?
Objects too small to see with the naked eye
The most common type, and the first invented, is the optical microscope, which uses lenses to refract visible light.
Q 02Around what year did the earliest known compound microscopes appear in Europe?
1620
The inventor is unknown; competing claims centre on the spectacle-making towns of the Netherlands.
Q 03Which Dutch spectacle-maker is claimed, by his own son, to have invented the compound microscope in 1590?
Zacharias Janssen
He was twice accused of counterfeiting coins, and the claim was made twenty years after his death.
Q 04In which Dutch town did the Janssen spectacle-makers live next door to the first man to seek a telescope patent?
Middelburg
Lippershey applied for the first telescope patent in 1608 and is also credited by some with the microscope.
Q 05What name did Galileo give to the compound microscope he built, before 'microscopio' was coined?
Occhiolino ('little eye')
Giovanni Faber coined 'microscopio' in a letter to Federico Cesi after Galileo submitted the instrument to the Accademia dei Lincei in 1625.
Q 06Whose 1665 book Micrographia had a huge impact largely because of its impressive illustrations?
Robert Hooke
He made his tiny lenses from glass globules formed by fusing the ends of threads of spun glass.
Q 07Which biological term did Micrographia originate?
Cell
Hooke coined it because walled plant cells in cork reminded him of the cells of a monastery.
Q 08The most famous fold-out plate in Micrographia, four times the size of the book, depicts what?
A louse
Samuel Pepys called it 'the most ingenious book that ever I read in my life'.
Q 09Micrographia was the first major publication of which institution?
The Royal Society
It became the first scientific best-seller and inspired wide public interest in microscopy.
Q 10Which Dutch draper and self-taught scientist is known as 'the Father of Microbiology'?
Antonie van Leeuwenhoek
He ran a cloth shop in Delft and took up lens-making to inspect thread more closely.
Q 11What did van Leeuwenhoek report to London's scientific society on 9 October 1676?
The discovery of micro-organisms
He called them 'animalcules' and found them everywhere, including on his own teeth.
Q 12How was van Leeuwenhoek's microscope constructed?
A tiny glass ball lens held between two riveted metal plates
A screw-adjusted needle held the specimen; the surviving examples magnify up to 275 times.
Q 13In what language did van Leeuwenhoek write all of his roughly 190 letters to London's scientific society?
Colloquial Dutch
Q 21Diffraction limits ordinary light microscopes to roughly what resolving distance?
200 nanometres
Higher magnifications are possible but reveal no more detail; electron microscopes reach about 0.1 nm.
Q 22What is placed between objective and cover slip to push numerical aperture as high as 1.6?
Immersion oil
Numerical apertures as high as 1.6 become possible, and such lenses usually magnify 40 to 100 times.
Q 23Which German optical engineer, partner of Carl Zeiss, was the first to define 'numerical aperture'?
Ernst Abbe
He also introduced the eight-hour working day at Zeiss in 1900 in memory of his father's 14-hour days.
Henry Oldenburg learned Dutch specifically to translate them; he never published a proper paper in Latin.
Q 14As of 2025, how many of van Leeuwenhoek's single-lens microscopes were known to survive?
Nine
He made at least 25 of them and more than 500 lenses; some may have magnified up to 500 times.
Q 15Which Delft painter, baptised four days before him, had van Leeuwenhoek as the executor of his will?
Johannes Vermeer
Some have suggested he is the model for Vermeer's The Astronomer and The Geographer.
Q 16Which visiting monarch did van Leeuwenhoek present with an 'eel-viewer' in 1697 to study blood circulation?
Peter the Great
The Tsar's boat was moored near Delft; other visitors over the years included Leibniz and John Locke.
Q 17Which Italian 'father of histology' began his microscopic studies with the lungs in the 1660s?
Marcello Malpighi
He observed capillaries in frog lungs in 1661, completing the circuit Harvey had predicted.
Q 18Who wrote The Fly's Eye (1644), the first detailed microscopic account of organic tissue?
Giambattista Odierna
Its Italian title was L'occhio della mosca; the microscope remained largely a novelty until the 1660s.
Q 19On a compound microscope, what is the lens closest to the eye called?
The eyepiece
Also called the ocular, it is a cylinder of two or more lenses that brings the image into focus for the eye.
Q 20A 10x ocular combined with a 100x objective gives what total magnification?
1,000x
Total magnification is the product of the two; oil immersion or ultraviolet light is needed to resolve detail beyond that.
Q 24Who developed the still-standard 1893 microscope illumination method that keeps the lamp filament out of the image?
August Köhler
Before it, the image of the light source was always visible superimposed on the specimen.
Q 25Which Dutch physicist won the 1953 Nobel Prize in Physics for inventing phase-contrast illumination?
Frits Zernike
It lets transparent samples such as live cells be imaged without staining, by using interference rather than absorption.
Q 26Who patented the principle of the confocal microscope in 1957?
Marvin Minsky
Better known as an AI pioneer, he was ahead of the lasers needed to make it practical; the first working laser-scanning version came in 1978.
Q 27Which fluorescent stain is commonly used to label DNA in cells?
DAPI
Fluorescence microscopy also relies on antibodies tagged with fluorescent reporters and on fluorescent proteins such as GFP.
Q 28Which German physicist, with engineer Max Knoll, built the first prototype electron microscope in 1931?
Ernst Ruska
He waited until 1986 for his Nobel Prize, sharing it with the inventors of the scanning tunneling microscope.
Q 29What does an electron microscope use in place of the glass lenses of a light microscope?
Electromagnets
Ruska showed in 1931 that a magnetic coil could act as a lens for electrons.
Q 30Roughly what resolution can electron microscopes achieve, compared with 200 nm for light microscopes?
0.1 nm
An electron's wavelength can be more than 100,000 times shorter than that of visible light.