By Robert T. Dixon
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Extra info for Dynamic Astronomy
5 Using this telescope with the 10-mm eyepiece, an extended object will appear almost 200 times as large as with the naked eye. Often the useful power of telescope If a limited by the object being viewed and/or the atmospheric conditions. an eyepiece with a focal length of 20 mately 40 is mm is chosen, the power will be approxi- 100. 3 METHODS OF ASTRONOMY For names of the letters of the Greek alphabet see Appendix 10. Objective lens Collimating lens Photo plate o The spectrograph. 42 o o The spectrograph Spectroscopy is one of the most important areas in astronomy.
Destructive interference occurs along line AB, constructive interference, along line CD. (Ealing Films, Inc. 18. 16 Crest of one wave meets trough of the other wave, that at other angles the light constructively, interfere resulting producing bright regions on the screen. V in destructive inter- ference. 19). sulting in constructive inter- ference. The We particle nature of light have seen many experiments that demonstrate that behaves light like waves. Some experiments require another kind experiment attached to its an be performed using an with electroscope Such explanation.
E. when when they went behind the planet and then reappeared on the other side. By 1675 the Danish astronomer Roemer became interested in one of these moons, called Io, and he timed its eclipses very accurately, hoping to find in its motions a natural clock that could be used for purposes of navigation. 1 Galileo's telescopes. 5 min (minutes) between could this requires almost 12 yr (years) to one it trip How eclipses. be explained? Since Jupiter around the sun, to be stationary in make us consider let space for the sake of our discussion.
Dynamic Astronomy by Robert T. Dixon