An astronomical telescope has a magnification of 7.5×. If the two lenses are 28 cm apart, determ

step 1 So in this astronomical telescope we are given the magnification the total magnification of the

An astronomical telescope has a magnification of 7.5×. If...

Key Concepts

Astronomical Telescope

An astronomical telescope is an optical instrument designed to view distant objects by forming an image through two lenses – the objective and the eyepiece. It is configured so that parallel rays from a remote object are focused by the objective lens and then magnified by the eyepiece, yielding an enlarged virtual image for the observer.

Magnification

Magnification in an astronomical telescope is defined as the ratio of the focal length of the objective lens to that of the eyepiece. This ratio determines how much larger the telescope makes the image of a distant object compared to viewing it with the naked eye.

Focal Length

The focal length of a lens is the distance over which initially collimated rays are brought into focus. In telescopes, knowing the focal lengths of both the objective and the eyepiece is crucial because they determine the angular magnification and the overall length of the telescope tube.

Optical Tube Length

In a typical astronomical telescope that produces an image at infinity, the separation between the objective and the eyepiece lenses is approximately the sum of their focal lengths. This relationship helps in determining the design and physical dimensions of the telescope when specific magnification requirements are set.

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