![]() You may be familiar with the popular image of an astronomer squinting into an eyepiece to look at distant objects. For telescopes, additional lenses or a compound lenses can be used to turn images right side up for many spyglasses, although this is not a serious problem in astronomy, as there is not defined up or down in space. ![]() ![]() Fortunately, our brain can interpret the signals from the retina to put things right side up. Using a single convex lens (a lens that bulges outward), images appear upside on the focal plane. The retina is located at the focal plane, the plane where light from different directions comes into focus. It bends the light entering you eye to focus it onto your retina. Also, the Sun appears distorted at sunset as the Sun’s rays pass through a thicker layer of atmosphere, causing additional refraction. The shape of the lens then focuses the light waves by causing the parallel rays to a single point. So, as light waves travel from air to a curved lens, the waves become bent. Refraction results from the bending of light waves as it travels from one medium to another. Galileo used a refracting telescope, one that uses a curved lens to focus light rays to a focal point. While Galileo did not invent the telescope, he made significant improvements in the original design and was the first to use to study the night sky. Since the time of Galileo (Chapter 3), astronomers have used telescopes to examine the planets and stars. \)īiconvex Lens used to focus light rays onto a focal point.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |