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Pranav Jha
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why do telescopes have long barrels? Binoculars use pairs of prisms to lengthen the light path between lenses, but why? What advantage does the lengthening the path of light have?
Pranav Jha said:why do telescopes have long barrels? Binoculars use pairs of prisms to lengthen the light path between lenses, but why? What advantage does the lengthening the path of light have?
Pranav Jha said:why does it have long barrel on the first place?
Dadface said:Angular magnification=Fo/Fe and in normal adjustment the lenses are separated by a distance given by Fo+Fe.
(Fo= focal length of objective lens,Fe= focal length of eyepiece lens)
It follows that for high magnification Fo is large.
Pranav Jha said:could you simplify please
Pranav Jha said:i don't get any of these stuffs.I was reading about total internal reflection in binoculars and while reading the question popped up in my mind. Could anyone of you suggest the reading required to understand the answers that have been posted
The long barrel of a telescope is used to increase the focal length, which in turn increases the magnification of the image being viewed. This allows for a clearer and more detailed view of distant objects.
The length of the barrel is directly related to the magnification and resolving power of the telescope. A longer barrel will typically result in higher magnification and better image quality.
Some telescopes, particularly refracting telescopes, have a fixed length barrel that cannot be adjusted. However, many modern telescopes, such as reflecting telescopes, have a focusing mechanism that allows for the length of the barrel to be adjusted.
A longer barrel may make the telescope bulkier and more difficult to transport. It may also increase the weight of the telescope, making it more challenging to set up and maneuver.
The ideal length of a telescope's barrel will depend on the specific telescope and its intended use. A longer barrel is generally better for viewing distant objects, while a shorter barrel may be more suitable for observing closer objects or for portability.