Microscopes Trivia
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100 free Microscopes trivia questions with answers — technology quiz, new questions added Oct 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 100 questions with answers and explanations. Play the quiz
Q 01Vermont farmer Wilson Bentley attached a camera to his microscope in 1885 to photograph what?
Snowflakes
Snowflakes: after photographing crystal after crystal before it could melt, Bentley argued that no two snow crystals are alike, an idea that caught the public imagination.
Q 02Robert Brown saw pollen particles jiggling in water under his microscope; who explained the motion in 1905?
Albert Einstein
Albert Einstein showed the particles were being jostled by individual water molecules, and his explanation became convincing evidence that atoms and molecules exist.
Q 03Which Dutch spectacle-maker is claimed, by his own son, to have invented the compound microscope in 1590?
Zacharias Janssen
Zacharias Janssen's son made the claim in 1655, about twenty years after his father's death, and historians suspect the story may have been invented.
Q 04Which Dutch town housed, as neighbours, the spectacle-makers credited with the microscope and telescope?
Middelburg
Middelburg, capital of Zeeland, housed both rival spectacle-making households, yet their claims were never settled and the microscope's true inventor is still unknown.
Q 05What name did Galileo give to the compound microscope he built, before 'microscopio' was coined?
Occhiolino ('little eye')
Occhiolino ('little eye') was Galileo's name for the instrument he sent Prince Federico Cesi in 1624; a year later fellow Lincean Giovanni Faber coined the word 'microscope'.
Q 06Whose 1665 book Micrographia had a huge impact largely because of its impressive illustrations?
Robert Hooke
Robert Hooke also studied petrified wood under his microscope, and argued that fossils were the remains of once-living things.
Q 07Which biological term did Micrographia originate?
Cell
Cell was coined in Micrographia: its author found a thin slice of cork 'all perforated and porous, much like a Honey-comb', and called those pores cells.
Q 08Besides its famous flea, which parasite did Micrographia's author also draw?
A louse
A louse gets an engraving of its own, and the text jokes that it will never be quiet till it has drawn blood.
Q 09Micrographia was the first major publication of which institution?
The Royal Society
The Royal Society ordered the book printed, yet it was often too short of money to pay its author his salary.
Q 10Which illumination technique blocks the direct beam so only specimen-scattered light reaches the objective?
Dark-field
Dark-field illumination makes unstained, transparent specimens shine bright on a black background, which is why it suits live, water-borne microbes that have not been dyed.
Q 11What did van Leeuwenhoek describe in his letter of 9 October 1676?
The discovery of micro-organisms
The discovery of micro-organisms: his letter of 9 October 1676 described tiny 'animalcules' in water, and he later found them swarming in the plaque between his own teeth.
Q 12How was van Leeuwenhoek's microscope built?
A tiny lens set in a metal plate
A tiny lens set in a metal plate: the user held it right up to the eye while screws moved the specimen, pinned on a point, into focus.
Q 13What was van Leeuwenhoek's trade in Delft, long before his microscope letters made him famous?
Cloth merchant
Q 21Diffraction limits ordinary light microscopes to roughly what resolving distance?
200 nanometres
200 nanometres, about half the wavelength of light, is why structures as small as single proteins could never be made out with an ordinary light microscope.
Q 22What is placed between objective and cover slip to push numerical aperture as high as 1.5?
Immersion oil
Immersion oil has a refractive index near 1.5, like glass, so light isn't bent away at the cover slip and the objective can gather more of it.
Q 23Which German physicist, partner of Carl Zeiss, was the first to define 'numerical aperture'?
Ernst Abbe
Cloth merchant: he kept a draper's shop and held minor city posts, yet he made his own lenses by hand, more than 500 of them, and with them uncovered many of nature's secrets.
Q 14Robert Koch won the 1905 Nobel Prize for work on which disease, whose bacterium he spotted under his microscope?
Tuberculosis
Tuberculosis: Koch announced the discovery in Berlin on 24 March 1882, and the WHO marks that date every year as World TB Day.
Q 15Which Delft painter, baptised four days before van Leeuwenhoek, left a bankrupt estate the microscopist was appointed to manage?
Johannes Vermeer
Johannes Vermeer died in 1675 owing money to creditors, so his widow petitioned the court for relief, and van Leeuwenhoek was appointed trustee of the estate.
Q 16Which visiting monarch did van Leeuwenhoek show an 'eel-viewer' for blood circulation at Delft?
Peter the Great
Peter the Great, touring western Europe with his Grand Embassy, had his boat moored near Delft and had van Leeuwenhoek brought aboard to show him blood circulating in an eel's tail.
Q 17Which Italian 'father of histology' began his microscopic studies with the lungs in the 1660s?
Marcello Malpighi
Marcello Malpighi found the capillaries in the lungs in 1661, the link between arteries and veins that had eluded William Harvey.
Q 18Using an electron microscope, Scottish virologist June Almeida identified the first human example of which kind of virus?
Coronavirus
Coronavirus: Almeida, a bus driver's daughter who left school at 16, helped name the group after the crown-like halo she saw around each particle.
Q 19On a compound microscope, what is the lens at the top of the tube called?
The eyepiece
The eyepiece magnifies the image the objective has already projected into the tube, so the specimen is enlarged in two stages.
Q 20Manu Prakash's Foldscope, a microscope costing under a dollar in parts, is made mainly from what?
Paper
Paper: Prakash came up with it after seeing an expensive microscope at a research station in Thailand that everyone was afraid to use.
Ernst Abbe was first to define numerical aperture, and the resolution limit his 1873 equation set for light microscopes stood until the 2014 Chemistry Nobel laureates bypassed it.
Q 24Who developed the 1893 microscope illumination method that keeps the lamp filament out of the image?
August Köhler
August Köhler published the method in 1893 to improve photomicrographs: focusing the lamp's image at the condenser aperture instead of the specimen gives even lighting with no filament in view.
Q 25Which Dutch physicist won the 1953 Nobel Prize in Physics for inventing the phase-contrast microscope?
Frits Zernike
Frits Zernike's method turns invisible phase shifts in transparent samples into visible contrast, so biologists could study living specimens without the stains that once killed them.
Q 26Who patented the principle of the confocal microscope in 1957?
Marvin Minsky
Marvin Minsky, better known as a founder of artificial intelligence, built his first confocal scanning microscope in 1955 while a Harvard Junior Fellow and filed the patent in 1957.
Q 27Which fluorescent stain do microscopists commonly use to label DNA?
DAPI
DAPI binds to the A-T-rich stretches of DNA and glows blue under ultraviolet light, so it marks the nucleus while dyes in other colours mark the rest.
Q 28Which German physicist, with engineer Max Knoll, built the first prototype electron microscope in 1931?
Ernst Ruska
Ernst Ruska, working with Max Knoll at the Berlin Technical University, built the first electron microscope prototype in 1931 and shared a Nobel Prize in Physics more than half a century later.
Q 29What does an electron microscope use in place of the glass lenses of a light microscope?
Electromagnets
Electromagnets act as the lenses: a current-carrying coil bends a beam of electrons the way glass bends light, as Hans Busch calculated in 1926, though he never tested it himself.
Q 30Roughly what resolution can electron microscopes achieve?
0.1 nm
0.1 nm is within reach because an electron's wavelength can be more than 100,000 times shorter than that of visible light, and shorter waves resolve finer detail.