What did Galileo see with his refracting telescope?

Galilean telescope, instrument for viewing distant objects, named after the great Italian scientist Galileo Galilei (1564–1642), who first constructed one in 1609. With it, he discovered Jupiter’s four largest satellites, spots on the Sun, phases of Venus, and hills and valleys on the Moon.

Was Galileo’s telescope a refractor?

The basic tool that Galileo used was a crude refracting telescope. His initial version only magnified 8x but was soon refined to the 20x magnification he used for his observations for Sidereus nuncius. It had a convex objective lens and a concave eyepiece in a long tube.

What is a refractor telescope best used to view?

Refractor telescopes use specialized lenses that make them a favorite for deep space objects like galaxies and nebulae. Reflector telescopes are more popular with larger and brighter objects like the Moon and planets because they use mirrors that provide more sensitivity to all wavelengths.

What did Galileo see with his telescope quizlet?

By observing the Sun, Galileo discovered that there are dark, cooler spots on the Sun, called Sun spots. These observations also caused him to go blind. Using a very basic telescope, Galileo was able to identify 4 large moons orbiting Jupiter; Io, Europa, Ganymede, Callisto.

How does a Galilean telescope produce an upright image?

This arrangement of three lenses in a telescope produces an upright final image. The first two lenses are far enough apart that the second lens inverts the image of the first one more time. The third lens acts as a magnifier and keeps the image upright and in a location that is easy to view.

What can you see with a 90mm refractor?

A 90mm telescope will provide you with a clear view of the Saturn along with its rings, Uranus, Neptune, and Jupiter with its Great Red Spot. You can also expect to see stars with 12 stellar magnitude with a 90mm telescope.

Is a 50mm refractor telescope good?

50mm (2 in) telescopes are the most basic, entry-level, budget telescopes on the market. They are mostly targeted at kids and some of them could even fall into the toy category. We generally don’t recommend 50mm telescopes unless you are on a very tight budget or you are looking for a gift for a 5-year-old.

Was Galileo’s telescope reflected?

The reflected light struck a secondary mirror Newton had affixed inside the tube at a 45-degree angle. That secondary mirror, in turn, bounced the light (and thus the image seen) into a convex eyepiece lens built into the side of the tube. This was the first working reflecting telescope.