It's hard enough to ID right-side up birds. And a mirror image will just mess with your mind. Try following a bird that looks like its moving right, when in reality it's moving left. Astronomy telescopes are typically designed with a longer focal length for higher magnifications, but sm...
Have a friend measure the distance between the two magnifying glasses and write the distance down. Cut a slot in the cardboard tube near the front opening about an inch (2.5 cm) away. Do not cut all the way through the tube. The slot should be able to hold the large magnifying glass...
Let’s go back to my old two‑way ported Tannoys. The term ‘two‑way’ in this context means a speaker with two drivers: a relatively large one (usually concave and cone‑shaped) called a ‘woofer’, and a much smaller driver (commonly a convex dome) called a ‘tweeter’. The...
Newton placed the primary mirror in the back of the tube. Because the mirror reflected light back into the tube, he had to use a small, flat mirror (secondary mirror) in the focal path of the primary mirror to deflect the image out through the side of the tube, to the eyepiece; ...
Newton placed the primary mirror in the back of the tube. Because the mirror reflected light back into the tube, he had to use a small, flat mirror (secondary mirror) in the focal path of the primary mirror to deflect the image out through the side of the tube, to the eyepiece; ...
Weak radio waves also demand careful aiming of the mirror. In some radio telescopes the dish surface is equatorially mounted; one axis is parallel to the rotation axis of the earth. This mounting technique allows the telescope to follow a position in the sky as the earth rotates by movin...
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Newton placed the primary mirror in the back of the tube. Because the mirror reflected light back into the tube, he had to use a small, flat mirror (secondary mirror) in the focal path of the primary mirror to deflect the image out through the side of the tube, to the eyepiece; ...
Newton placed the primary mirror in the back of the tube. Because the mirror reflected light back into the tube, he had to use a small, flat mirror (secondary mirror) in the focal path of the primary mirror to deflect the image out through the side of the tube, to the eyepiece; ...