Analysis Of Refractor Telescope

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The refractor telescope uses two glass lenses, the objective lens and the eyepiece len, to collect and refract parallel rays of light from distant objects in a specific way to produce a image that fits the size of our eyes pupil. The light rays are gathered through the opening of the telescope called the aperture, they then travel through the objective lens and refract onto a single point called the focal point. From here the light rays continue to travel in the same direction until they reach the eyepiece lens, which refracts the light back into parallel rays. Distant objects appear brighter, clearer and much more magnified than they really are because of this process. The magnification of a telescope can be calculated by using this formula …show more content…

The objective lens is the largest lens, with the largest focal length out of the two, it collects light and produces a real image of a distant object. The eyepiece lens is the smaller lens, with the smallest focal length, it takes the bright light from the focus of the objective lens and magnifies the image so that it takes up a lot of space on your retina. The final image that is created by the two lenses is inverted. This is because the objective lens inverts, but the eyepiece does not. for telescopes the image needs to be the right way up, so 45 degree prisms are placed between the objective lens and the eyepiece lens, this has the effect of turning the image the correct way up. Here is a diagram of how light travels through both the eyepiece lens and the objective …show more content…

Farsightedness is the inability to focus on images that are close up. The two main reasons people's eyes become farsighted later in life is because of the weakening of ciliary muscles or the decrease of flexibility of the lens in the eye. These 2 causes result to the lens in the eye unable of assuming the high curvature needed to see close up objects. The lens has a small capability of refracting light, and the images that are from close up objects are located behind the retina. The retinal surface where the light detecting cells are, detect that the close up objects are blurry. To help people with hyperopia a concave mirror is used to refract the light, scene as the lens within the eye cannot assume the high curved shape that is needed to see close up objects. The concave lens will refract the light rays before it enters the eye, therefore decreasing the images distance. Because the process where refraction of light occurs before the light reaches the eye the image of the close up object is focused on the retinal surface, creating a clear

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