A refractor b newtonian reflector c schmidt

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a. Refractor b. Newtonian reflector c. Schmidt Cassegrain 4. Draw a sketch of how light rays travel thru the telescope and end up coming out the eyepiece. See your textbook for examples. 5. Note there are 2 eyepieces included: 20 mm and 4 mm. These are the focal lengths (mm = millimeter) of the eyepiece. You’re told on the box that the eyepieces provide 15X and 75X magnification. 6. NEVER LOOK AT THE SUN WITH A TELESCOPE (unless it has been fitted with special filters). What do you think this would do to your eye if you looked at the sun without the special filter? 7. Set up the telescope on a table inside a room at least 15’ long. Insert the 20mm eyepiece (you may need to loosen and/or tighten the 2 small thumb-screws at the end of the focuser where the
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9 eyepiece goes in) and point the telescope across the room at a target (an open book or magazine works nice). Turn the focus knob until the object produces a sharp image. If you can’t achieve good focus, the object may be too close. Notice how sensitive the focusing is. Also notice the image is upside-down! Now insert the 4mm (75X) eyepiece and focus. You can use this telescope as a microscope! At 75X, objects appear 75 times larger! 8. Take the telescope outside during daylight. NEVER TRY TO LOOK AT THE SUN, YOU WILL PERMANENTLY DAMAGE YOUR EYES!!!!! Use the telescope to look at trees, houses, etc. both nearby and faraway. Switch back and forth between low power (15X) and high power (75X). Notice how you can aim the scope by “sighting” along the outside of the main tube, as if the telescope were a gun. Practice doing this, as it will make things easier at night. 9. If you want, try to use your digital camera or cell-phone camera to take a picture thru the telescope. Experiment holding the camera right up to the eyepiece. Try both eyepieces. The easiest object to observe in the night sky is the moon. Assuming the moon is visible (and it may not be depending on its phase), set up the telescope outside within clear view of the moon. Center the telescope on the moon.
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10 10. Observe the moon using both low and high powers. a. Make a sketch of what you see at 15X and at 75X. b. What phase is the moon in? 11. Use the telescope with your moon map, which you picked up with the telescope, and try to locate several features (mare, craters, etc). Find and record at least 3 features from the map.
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11 Additional Astronomy Telescope Activities (Note: If you’ve already done the above activities and wish to receive additional extra credit, you may complete the activities below. You get extra credit for each 3 objects you observe. 1. Repeat the moon observations described in #11 (Section I or II). Be sure to identify 3 new features not previously observed by you. 2. By using the IPad apps or other star map, locate and observe Mars, Venus, Mercury, Jupiter or Saturn. These planets are not always visible; it depends on the time of year and time of night, etc. Sketch what you see, and indicate the date/time observed.
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