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A well-designed refracting telescope is a pleasure to use Nevertheless, there are certain problems inherent in their design These are known as spherical aberration, chromatic aberration, and lens sag Spherical aberration results from the fact that spherical convex lenses don t bring parallel light rays to a perfect focus Thus a refracting telescope with a spherical objective will focus a ray passing through its edge a little differently than a ray passing closer to the center The actual focus of the objective is not a point but a very short line along the lens axis This effect causes slight blurring of images of objects that have relatively large angular diameters, such as nebulae and galaxies The problem can be corrected by grinding the objective lens so that it has paraboloidal rather than spherical surfaces Chromatic aberration occurs because the glass in an objective lens refracts the shortest wavelengths of light slightly more than the longest wavelengths The focal length of any given convex lens therefore is shorter for violet light than for blue light, shorter for blue light than for yellow light, and shorter for yellow light than for red light This produces rainbowcolored halos around star images, as well as along sharply defined edges in objects with large angular diameters Chromatic aberration can be corrected by the use of compound lenses These lenses have two or more sections made of different types of glass; the sections are glued together with a special transparent adhesive Such objectives are called achromatic lenses and are standard issue in refracting telescopes these days

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8: Errors, Exceptions, and Bugs, Oh My!

Lens sag occurs in the largest refracting telescopes When an objective is larger than approximately 1 m (about 40 in) across, it becomes so massive that its own weight distorts its shape Glass is not perfectly rigid, as you have noticed if you have seen the reflection of the landscape in a large window on a windy day There is no way to get rid of this problem with a refractor except to take the telescope out of Earth s gravitational field

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