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What is the focal length of a telescope's mirror if I use an eyepiece with a focal length of 26 mm and I get a magnification of 70x?
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∙ 14y ago
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∙ 14y ago
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How can the magnifying power of a telescope be increased?
a telescope's magnification is calculated as the ratio of the focal length of the primary objective to the focal length of the eyepiece. Since a telescope is defined by the primary objective, this part of it is essentially unchangeable. Therefore, the way to increase magnification is to decrease the focal length of the eyepiece. For example, a 1000mm objective and a 25mm eyepiece yields a magnification of (1000/25) 40x. Changing the eyepiece to a 10mm eyepiece increases magnification to (1000/10) 100x.
Telescope magnification power with a 30 mm eyepiece for a telescope?
That all depends on the focal length of the telescopes objective mirror or lens, which is not stated in the question. Find the focal length of the main lens at the front of the tube, or the main mirror at the back. It's printed somewhere on the telescope itself, or else on the box it came in. Make sure the number is in millimeters, and then divide it by 30 (the focal length of your eyepiece). The answer is the magnification you'll get with that particular eyepiece in that particular scope.
Show How to calculate the magnification of a telescope with a 1000mm focal length an8-inch primary mirror a 4-foot body tube and a 25 mm eyepiece?
The apparent magnification of telescope optics is(focal length of the objective) / (focal length of the eyepiece)= (1,000 / 25) = 40 .The diameter of the primary mirror has no effect on the apparent magnification.The length of the body tube is involved in the case of the Newtonian configuration,only because it has to be long enough to hold the eyepiece in the right place.
The magnification of a telescope is changed by changing the what?
The magnification of a telescope is the ratio of the effective focal length of the objective to the focal length of the eyepiece. For example, a small telescope's objective may have a focal length of 800mm. When an eyepiece with a focal length of 25mm is used, the magnification is 800/25 = 32. The term "effective focal length" refers to the focal length of the objective as affected by any "focal extender". Many telescopes are designed to have a short total size, but high power, by "folding" the optical path. A mirror-type objective with a focal length of perhaps 800mm is coupled with a smaller curved mirror that intercepts the last 200mm and extends it to 800mm, a 4x extension, so that the effective focal length of that objective is 3200mm. Use that with a 25mm eyepiece and the magnification is 3200/25 = 128. By the way, if a telescope is smaller than you are, it is seldom much use to view using a magnification greater than 50 to 100. Most objects are best viewed at relatively low powers such as 30 or so.
What is the formula for light gathering power for telescopes?
For visual observation: Magnification = (Focal Length of Objective Lens) divided by (Focal Length of Eyepiece) (They have to be measured in the same units.) For prime-focus photography: (One focal-length of the Objective Lens on the film) = (one radian in the sky)
What is the power of the eyepiece?
The magnification, or power, at which a telescope is operating is a function of the focal length of the telescope's main (objective) lens (or primary mirror) and the focal length of the eyepiece employed.
How can the magnifying power of a telescope be increased?
a telescope's magnification is calculated as the ratio of the focal length of the primary objective to the focal length of the eyepiece. Since a telescope is defined by the primary objective, this part of it is essentially unchangeable. Therefore, the way to increase magnification is to decrease the focal length of the eyepiece. For example, a 1000mm objective and a 25mm eyepiece yields a magnification of (1000/25) 40x. Changing the eyepiece to a 10mm eyepiece increases magnification to (1000/10) 100x.
What are some reasons for using mirrors in telescopes?
In telescopes that use them, mirrors are the principal mechanism of magnification. The mirror is what gathers the light, and the more light gathered the better. The eyepiece is not the principal magnifier; the eyepiece serves to focus the gathered light so that it can make a clear image on the retina. The larger the mirror, the more light is gathered, and the better the telescope is.
Telescope magnification power with a 30 mm eyepiece for a telescope?
That all depends on the focal length of the telescopes objective mirror or lens, which is not stated in the question. Find the focal length of the main lens at the front of the tube, or the main mirror at the back. It's printed somewhere on the telescope itself, or else on the box it came in. Make sure the number is in millimeters, and then divide it by 30 (the focal length of your eyepiece). The answer is the magnification you'll get with that particular eyepiece in that particular scope.
Show How to calculate the magnification of a telescope with a 1000mm focal length an8-inch primary mirror a 4-foot body tube and a 25 mm eyepiece?
The apparent magnification of telescope optics is(focal length of the objective) / (focal length of the eyepiece)= (1,000 / 25) = 40 .The diameter of the primary mirror has no effect on the apparent magnification.The length of the body tube is involved in the case of the Newtonian configuration,only because it has to be long enough to hold the eyepiece in the right place.
The magnification of a telescope is changed by changing the?
The magnification of a telescope is the ratio of the effective focal length of the objective to the focal length of the eyepiece. For example, a small telescope's objective may have a focal length of 800mm. When an eyepiece with a focal length of 25mm is used, the magnification is 800/25 = 32. The term "effective focal length" refers to the focal length of the objective as affected by any "focal extender". Many telescopes are designed to have a short total size, but high power, by "folding" the optical path. A mirror-type objective with a focal length of perhaps 800mm is coupled with a smaller curved mirror that intercepts the last 200mm and extends it to 800mm, a 4x extension, so that the effective focal length of that objective is 3200mm. Use that with a 25mm eyepiece and the magnification is 3200/25 = 128. By the way, if a telescope is smaller than you are, it is seldom much use to view using a magnification greater than 50 to 100. Most objects are best viewed at relatively low powers such as 30 or so.
The magnification of a telescope is changed by changing the what?
The magnification of a telescope is the ratio of the effective focal length of the objective to the focal length of the eyepiece. For example, a small telescope's objective may have a focal length of 800mm. When an eyepiece with a focal length of 25mm is used, the magnification is 800/25 = 32. The term "effective focal length" refers to the focal length of the objective as affected by any "focal extender". Many telescopes are designed to have a short total size, but high power, by "folding" the optical path. A mirror-type objective with a focal length of perhaps 800mm is coupled with a smaller curved mirror that intercepts the last 200mm and extends it to 800mm, a 4x extension, so that the effective focal length of that objective is 3200mm. Use that with a 25mm eyepiece and the magnification is 3200/25 = 128. By the way, if a telescope is smaller than you are, it is seldom much use to view using a magnification greater than 50 to 100. Most objects are best viewed at relatively low powers such as 30 or so.
What is the formula for light gathering power for telescopes?
For visual observation: Magnification = (Focal Length of Objective Lens) divided by (Focal Length of Eyepiece) (They have to be measured in the same units.) For prime-focus photography: (One focal-length of the Objective Lens on the film) = (one radian in the sky)
If the primary mirror of a telescope have a focal length of 225 centimeters and the eyepiece has a focal length of 7.5 millimeters then what is the magnifying power of the telescope?
The magnifying power of a telescope is the focal length of the scope in millimeters, divided by the focal length of the eyepiece in millimeters. Focal length of scope: 225cm=2250mm Focal length of eyepiece: 7.5mm 2250/7.5= 300X
How do you use a reflector telescope?
The magnification of any reflector telescope is given by the focal length of the mirror divided by the focal length of the eyepiece, so if the mirror's focal length is 1000mm and the eyepiece has a focal length of 10mm, then the magnification is 1000 / 10 or 100 X magnification. So, if you wish to increase the magnification you need to either change the mirror (which is impractical) or change the eyepiece (which is easy) replacing it with an eyepiece with a shorter focal length. So, if the new eyepiece has a focal length of 5mm then the magnification is 1000/5 or 200 X magnification. If you do not wish to buy an expensive complete set of eyepieces, you can buy what is called a Barlow lens which fits between the eyepiece and the telescope. These can increase the magnification by a factor of 2 or 3, but the quality of the image is not so good (as the light has to pass through the Barlow lens as well as the eyepiece). Do not forget that you cannot keep increasing magnification hoping to get better and better images. As you double the magnification, you cut the light entering the telescope by at least a half, so the image is dimmer. Most small telescopes with mirrors between 6 and 8 inches can magnify up to around 100 X effectively but anything more than this will result in the image becoming progressively darker, more grainy and generally not so clear. To get higher magnification you need much bigger mirrors of 10 or 12 inches or more. To add further complications, you will also need a substantial mount for the 'scope as any small vibration at a high magnification will result in a great deal of image shake. Also, you will need a really good motor drive to compensate for the movement of the earth, as, without such a drive at high magnifications, the image will move out of the field of view almost as quickly as you find it due to the earth's motion.
What are the optical parts of the microscope. How does it achieve magnification and Resolution?
The main parts of an optical microscope are: the eyepiece, objective lense and light source (sometimes a mirror). The objective lense has a short focal length so it produces an image a little bit up the microscope's tube which is then magnified by the eyepiece. Resolution is dependant on the numerical appeture of the lense and the wavelenght of the light source used.
What is the Magnification equation for convex mirror?
What is the nature of linear magnification of a convex mirror
