6th Dops meeting quiz

 성질이 급해서 그런지 미리 내고 싶어졌다. 생각이 날 때 미리미리 하는 것도 나쁘지 않을 것 같다.
 
1. What is the most important thing which we should keep in mind when you are to make the secondary cage? Why do you think that?
 
2. For the secondary cage for the 20-inch telescope, it is considered to be pertinent to have 15 pounds weight. Then how much may it for the 13-inch telescope weigh?
 
3. What is the main purpose of the secondary cage?
 
4. Have you ever heard about the Telrad finder and the digital setting-circle? If you should have not, you should investigate the usage of the equipments.
 
5. Write the formula of the distance from the secondary to the focal plane.
 
6. Think about the truss-tube adventage.
 
7. The field of view for a large-aperture telescope at low power is about 1/2deg. This means that the incoming light paths from indivisual stars are cylinders that can deviate by 1/4deg from the optical axis of the telescope. So the diameter fo the incoming light path can be represented by the formula, the diameter of the primary plus the ............?
Caution : Don`t write the answer same as the content of the textbook! 
 
8. The inside diameter of the secondary cage must be larger than that of incoming light. Explain the reason by comparing the two formula noted in the textbook.
 
나머지는 다음에... 여기까지는 6.1까지의 내용입니다. 그럼 16일 날 봅시다.