Astronomical telescope refraction problem, an easy one

In summary, the conversation discusses designing an astronomical telescope with an angular magnification of +5 and a length of 16 cm. The equations M=-(f_objective/f_ocular) and L=f_ocular+f_objective are used to calculate the focal lengths of the objective and ocular lenses. The solution is found to be f_objective = 20 cm and f_ocular = -4 cm. The question of whether an astronomical telescope must consist of two convergent lenses is raised, and it is determined that this is not always the case.
  • #1
alpyurtsever
4
0

Homework Statement



1.a) Design an astronomical telescope with an angular magnification of +5 (pay attention to + sign !) and
length of 16 cm, i.e. compute fobjective and focular).

Homework Equations



M=-(f_objective/f_ocular)
L=f_ocular+f_objective

The Attempt at a Solution



f_objective=16-f_ocular

M=-(16-f_ocular)/f_ocular

f_ocular = -4 cm
f_objective= 20 cm

I have found like that, but it says that it is an astronomical telescope in the question, where am I doing wrong. Astronomical telescope must consist of 2 convergent lenses, isn't it?
 
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  • #2
alpyurtsever said:
Astronomical telescope must consist of 2 convergent lenses, isn't it?
No, not necessarily. Your solution looks good :smile:
 

1. How does refraction affect the images seen through an astronomical telescope?

Refraction is the bending of light as it passes through different mediums, such as air or glass. In an astronomical telescope, the light from celestial objects must pass through the Earth's atmosphere before reaching the telescope's lenses. The Earth's atmosphere has varying densities and temperatures, causing the light to bend and distort, resulting in a slightly different image being seen through the telescope compared to what is actually there in space.

2. Can refraction be corrected in an astronomical telescope?

Yes, refraction can be corrected through the use of corrective lenses. These lenses are placed in the telescope's optical system to counteract the effects of refraction caused by the atmosphere. These lenses are often made of special glasses with specific properties that help minimize the distortion caused by refraction.

3. How does the angle of refraction affect the images seen through an astronomical telescope?

The angle of refraction determines the amount of bending that occurs in the light passing through the telescope's lenses. The larger the angle of refraction, the greater the distortion in the image. This can be a significant problem for astronomical telescopes as they require high levels of precision and accuracy in their images.

4. Are there any other factors that can cause refraction in an astronomical telescope?

Yes, there are several other factors that can cause refraction in an astronomical telescope. These include temperature changes within the telescope itself, the quality and cleanliness of the lenses, and any imperfections or defects in the lenses. All of these factors can contribute to the overall distortion of the image seen through the telescope.

5. How can refraction be minimized in an astronomical telescope?

Aside from using corrective lenses, there are a few other ways to minimize the effects of refraction in an astronomical telescope. One method is to use a larger telescope with a larger aperture, as this allows more light to enter and reduces the impact of refraction. Another method is to use adaptive optics, which involves using computer-controlled mirrors to counteract the effects of refraction in real-time. Additionally, locating the telescope in a high-altitude, dry, and stable environment can also help minimize the effects of refraction.

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