![]() One can get special lenses that have a special coating to reduce the amount of chromatic aberration but they are expensive. The result of this is that the edges of the image are blurred and coloured like fuzzy rainbows. This is how a prism splits white light into the visible spectrum. Smaller wavelengths refract more than longer wavelengths. Different wavelengths of light refract by different amounts. (eyepieces with smaller focal lengths are more powerful as they need to bend the light more). As you can see from this diagram below, which is taken from Galileo’s own work Sidereus Nuncius (The Starry. Less powerful to locate the star and more powerful to observe it closely. Galileo’s telescope was the prototype of the modern day refractor telescope. When you want to observe a star you will often switch eyepieces. At the end of the tube toward the object to be viewed is the objective, which consists of a convex (outward-curving) lens or a combination of lenses that act as a convex lens. You don’t always want an incredibly high magnification, e.g. The refracting telescope has a closed tube. ![]() Perfect telescope for your little astronomers to explore. Star gazers usually have a selection of eyepieces at hand. The new childrens astronomical telescope stimulates childrens interest in observing the sky. a refracting telescope has an objective of focal length 70cm and eyepiece 5cm. The magnification of a refracting telescope is equal to the focal length of the objective divided by the focal length of the eyepiece.Į.g. The magnification of a telescope or any optical instrument is how much bigger the image is compared with the object. We can represent this using a ray diagram which shows the path of imaginary rays of light passing through the telescope.įrom the diagram above we can see that the distance between the lenses is the sum of the focal lengths of the two lenses. Basically the objective lens produces an image of a distant object at its focus and the eyepiece lens magnifies this image. ![]() a star or planet.Ī simple refracting telescope consists of two lenses, the Objective and the eyepiece. A refracting telescope uses a combination of lenses to produce an image of a distant object, e.g. A lens is a piece of glass designed to bend the light that passes through it in such a way that an image may be produced. When a wave such as light passes from one medium to another at an angle it changes direction. In this article we will focus on refracting telescopes, although there are other types of telescopes such as reflecting. Telescopes also help us see many more stars than we can ever could with the naked eye. This includes the detail on the surfaces of close objects like the Moon and the planets. Since the invention of telescopes astronomers have been able to see a considerable amount when gazing into the vastness of space.
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