The early Janssen microscopes were compound microscopes, which use at least two lenses. The objective lens is positioned close to the object and produces an image that is picked up and magnified further by the second lens, called the eyepiece.
A Middelburg museum has one of the earliest Janssen microscopes, dated to 1595. It had three sliding tubes for different lenses, no tripod and was capable of magnifying three to nine times the true size. News about the microscopes spread quickly across Europe.
Galileo Galilei soon improved upon the compound microscope design in 1609. Galileo called his device an occhiolino, or "little eye."
English scientist Robert Hooke improved the microscope, too, and explored the structure of snowflakes, fleas, lice and plants. He coined the term "cell" from the Latin cella, which means "small room," because he compared the cells he saw in cork to the small rooms that monks lived in. In 1665, and detailed his observations in the book "Micrographia."
Answers & Comments
Answer:
The early Janssen microscopes were compound microscopes, which use at least two lenses. The objective lens is positioned close to the object and produces an image that is picked up and magnified further by the second lens, called the eyepiece.
A Middelburg museum has one of the earliest Janssen microscopes, dated to 1595. It had three sliding tubes for different lenses, no tripod and was capable of magnifying three to nine times the true size. News about the microscopes spread quickly across Europe.
Galileo Galilei soon improved upon the compound microscope design in 1609. Galileo called his device an occhiolino, or "little eye."
English scientist Robert Hooke improved the microscope, too, and explored the structure of snowflakes, fleas, lice and plants. He coined the term "cell" from the Latin cella, which means "small room," because he compared the cells he saw in cork to the small rooms that monks lived in. In 1665, and detailed his observations in the book "Micrographia."