When using a telescope, the angular magnification M is given by the equation M = ′ =fofe M = = ′ =fofe M = = ′ =fofe, where is the angle subtended by an object when viewed with the unaided eye, ′ is the angle subtended by a magnified image, fo and fe are the focal lengths of the objective and the eyepiece, respectively.

- For an astronomical telescope, the angular magnification m is defined as the ratio of the angle subtended by the image of an object viewed through a telescope to the angle subtended by the same object seen without the help of a telescope. The mathematical definition of angular magnification is as follows:

Contents

- 1 How do you calculate angular magnification?
- 2 What is the formula for magnification of a telescope?
- 3 What is the angular magnification of a telescope that has a 100 cm focal length?
- 4 What is the formula for angular magnification for a telescope in normal adjustment?
- 5 What is magnification of astronomical telescope?
- 6 How do you find the angular resolution of a telescope?
- 7 What can I see with a 700mm focal length telescope?
- 8 How do you calculate Barlow magnification?
- 9 What angle in degrees is subtended by a 25000 km diameter sunspot assume the sun is 1.50 108 km away?
- 10 What is a Cassegrain telescope used for?
- 11 What is the length of a telescope at normal adjustment?

## How do you calculate angular magnification?

For an astronomical telescope, the angular magnification m is defined as the ratio of the angle subtended by the image of an object observed via a telescope to the angle subtended by the same object observed without the help of a telescope. The mathematical definition of angular magnification is as follows: ;

## What is the formula for magnification of a telescope?

where M is the magnification of the image and fe is the fraction of the image. The focal length of the objective is denoted by the letter fo (sometimes referred to the telescope focal length).

## What is the angular magnification of a telescope that has a 100 cm focal length?

The angular magnification of a telescope is equal to the product of the negative of the focal length of the objective lens divided by the focal length of the telescope’s eyepiece. In this case, the result is minus 100 centimeters divided by two and a half centimeters equals negative 40 centimeters. That represents the amplification in angular terms.

## What is the formula for angular magnification for a telescope in normal adjustment?

When using a telescope, the angular magnification M is given by the equation M = ′ =fofe M = = ′ =fofe M = = ′ =fofe, where is the angle subtended by an object when viewed with the unaided eye, ′ is the angle subtended by a magnified image, fo and fe are the focal lengths of the objective and the eyepiece, respectively.

## What is magnification of astronomical telescope?

When using a telescope, the angular magnification M is given by the equation M = ′ =fofe M = = ′ =fofe M = = ′ =fofe, where is the angle subtended by an object when viewed with the unaided eye, ′ is the angle subtended by a magnified image, fo and fe are the focal lengths of the objective and eyepiece, respectively.

## How do you find the angular resolution of a telescope?

The angular resolution is related to the ratio of the wavelength, l, of the radiation divided by the diameter of the telescope: q = l/D. The wavelength, l, of the radiation is proportional to the diameter of the telescope. If you have 20/20 vision, your visual acuity is restricted by the diameter of your pupil, and glasses will not be able to improve your vision any more.

## What can I see with a 700mm focal length telescope?

It is quite easy to observe every planet in the Solar System using a telescope of 70mm aperture. On the Moon, you will be able to get a close look at the surface and easily discern the majority of its distinguishable features and craters. Mars is going to look fantastic.

## How do you calculate Barlow magnification?

A Barlow telescope works by essentially extending the focal length of the telescope and, as a result, the magnification of the telescope when used with a certain eyepiece. For example, if you use the Ultrascopic 30mm eyepiece in conjunction with a 1,200mm focal length telescope, the combined magnification is 40X (1,200/30=40).

## What angle in degrees is subtended by a 25000 km diameter sunspot assume the sun is 1.50 108 km away?

The angle subtended by a sunspot with a diameter of 25,000 kilometers is 0.0096 degrees.

## What is a Cassegrain telescope used for?

When used in astronomical telescopy, a Cassegrain reflector is a collection of mirrors that is designed to concentrate incoming light to a location near the primary light-gathering mirror. Laurent Cassegrain, a French priest, came up with the idea for the design in 1672.

## What is the length of a telescope at normal adjustment?

According to the results of the experiment, the length of the telescope in normal adjustment is 27 cm.