Mell What year did Hooke discover?
In 1672 he discovered the phenomenon of diffraction (the bending of light rays around corners); to explain it, he offered the wave theory of light. He stated the inverse square law to describe planetary motions in 1678, a law that Newton later used in modified form.
Who is Robert Hooke and what did he discover about cells?
While observing cork through his microscope, Hooke saw tiny boxlike cavities, which he illustrated and described as cells. He had discovered plant cells! Hooke’s discovery led to the understanding of cells as the smallest units of life—the foundation of cell theory.
What is the first cell on earth?
The first cells were most likely very simple prokaryotic forms. Ra- diometric dating indicates that the earth is 4 to 5 billion years old and that prokaryotes may have arisen more than 3.5 billion years ago. Eukaryotes are thought to have first appeared about 1.5 billion years ago.
What kind of telescope did Robert Hooke made?
The Gregorian telescope is a type of reflecting telescope designed by Scottish mathematician and astronomer James Gregory in the 17th century, and first built in 1673 by Robert Hooke. James Gregory was a contemporary of Isaac Newton. Both often worked simultaneously on similar projects.
What were Robert Hooke’s inventions?
Robert Hooke was an important 17th century English scientist, perhaps best known for Hooke’s Law, the invention of the compound microscope, and his cell theory.
What is the famous invention of Robert Hooke?
Robert Hooke was an English scientist most famous for Hooke’s Law of Elasticity and for being the first to extensively use the microscope for scientific exploration thus discovering the building block of life, cell.
What did Robert Hooke use?
Hooke used a bi-convex objective lens placed in the snout and two additional lenses, an eyepiece lens and a tube or field lens.