At age 12, he acquired a simple microscope, which he used in the majority of his free time.

Youngsters can also participate in activities like stain use, crystal growth and building a simple microscope.

The earliest microscopes had only 1 lens and are called simple microscopes.

The simplest microscope is an ordinary magnifying glass-a single double-convex lens.

A simple microscope is developed.

Simple microscopes were first invented in the 17th century, and the compound microscope (still used today) became available in the 19th century.

He also designed and built a number of telescopes and simple microscopes; several large lenses, engraved with his name, are still preserved in Florence.

Compound microscopes are heavier, larger and more expensive than simple microscopes due to the increased number of lenses used in construction.

Anton van Leeuwenhoek (1632-1723), Invention of a simple microscope and the discovery of microorganisms.

The hairpin length can be determined by direct imaging of the diffraction rings of the magnetic beads using a simple microscope.

A 'simple microscope' is a microscope that uses only one lens for magnification, and is the original light microscope.

Antoni van Leeuwenhoek (1632-1723), a Dutch tradesman, learned to grind lenses and assemble them into simple microscopes.

Now I want to beg you to look under the simple microscope at the enclosed leaves and seeds, and, if you possibly can, tell me their genera.

If you have access to a simple microscope - your local school system will probably let you use one - you can easily observe the stomata in a leaf epidermis.

Most research petrological microscopes have photomicrographic attachments, while simpler microscopes can be used with 35 mm SLR cameras fitted with appropriate adaptor rings.

It took about 150 years of optical development before the compound microscope was able to provide the same quality image as van Leeuwenhoek's simple microscopes, due to difficulties in configuring multiple lenses.

Note that both astronomical telescopes as well as simple microscopes produce an inverted image, thus the equation for the magnification of a telescope or microscope is often given with a minus sign.

Experience, however, has fully convinced me that the use of the compound without the simple microscope is absolutely injurious to progress of N[atural] History (excepting, of course, with Infusoria).

With his simple microscopes - skillfully ground, powerful single lenses capable of high image quality - he observed protozoa in rainwater and pond and well water and bacteria in the human mouth and intestine.