Welcome, today we have to talk about those fascinating instruments that allow us to observe galaxies and stars. We are talking about telescopes. Learn here a little about how it works and some of the different types.
How a telescope works
A telescope collects and concentrates light.
The larger the convex lens or concave mirror, the more of the light enters. And the more light that enters the telescope, the more distant objects we can see.
The human eye has its own convex lens (crystalline lens), but this lens is very small, so it collects very little light. A telescope allows us to see with greater precision, because its mirror is capable of capturing more light than the human eye.
The telescope focuses the light rays and creates an image.
To create a clear image, the telescope's lenses and mirrors collect the captured rays at a focused point. If the light is not collected at one point, the image will be blurred.
A bit of history
The Galileo refractor (created in 1609) used two lenses to collect as much starlight as possible and allow the human eye to see it. Light passing through a spherical mirror forms an image.
Galileo's spherical lens made the image blurry. In addition, such a lens breaks light into color components, resulting in a blurred area of color around the luminous object.
Thus, a convex spherical lens collected the light from the stars, and a concave lens following it, converted the collected light rays back to parallel, allowing them to restore clarity and clarity to the observed image.
Types of telescopes
Telescopes can be divided according to the way they work with light. These can be "lens", "mirror" telescopes and combined telescopes: mirror-lens.
Sky-Watcher BK 707AZ2 Refractor Telescope
An achromatic telescope on azimuth mount. Easy to operate, ideal for beginners. The best image is shown when observing the Moon and the terrestrial planets . It can be used to teach children the basics of astronomy. Includes eyepieces, Barlow lens and diagonal mirror for ground observation.
LevenhukSkylineTravelSun 50 Telescope
A compact entry-level refractor. It shows the Moon well, the planets are visible only as luminous points. The set includes a special protective filter that allows you to study the solar disk.
The main features of the model are: ease of operation, compactness, light weight, complete equipment. A perfect gift for a child.
BresserNationalGeographic 60/800 AZ Telescope
Long-focus achromatic-refractor for observing near and deep space and terrestrial landscapes. Mounted on an azimuth mount, it is easy to operate and suitable for beginners. The kit contains all the necessary accessories, you will not need to buy anything.
Sky-Watcher Telescope BK 909AZ3
Refractor with achromatic optics. The telescopic device makes it possible to effectively observe planets as well as nebulae and galaxies. It collects light well, so it shows even dim objects clearly. Best for exploring near space. Installed on an azimuth mount, complete with the necessary optical accessories.