![]() Telescopes have been the subject of many comics on xkcd. Because shadows are dark and the god is also dark, they cannot be seen by the refracting telescope due to the reduced light-gathering which has already been mentioned as a drawback in the main comic. His most famous appearance in modern media was in the 1940 Disney movie Fantasia (and Disney merchandise is also almost the only place that his name is spelled as Randall spelled it, with an "a" in the middle). Chernobog is a 12th century Slavic deity, whose name translates to black god. In reality, "shadow people" are a psychological phenomenon wherein humans ascribe human shapes and movements to shadows in dark spaces. Of course also neither the shadow people nor the god exists so this would likewise be a moot point. So of course the refracting telescope is still the best. The title text expands on the seeing of supernatural beings, as another negative point is added to the refracting telescope it apparently can't see Shadow People or the Slavic god Chernabog (sometimes spelled Chernobog), both of which are important although clearly not as important to the telescope's merit as seeing vampires since the fact is only mentioned in the title text. On this theory, however, the reflector could too, since modern astronomical mirrors are coated with aluminum, not silver. If mirror-non-appearance of vampires is due to the interaction of evil with silver, a refractor using a prism could still see vampires. This uses the optical principle of total internal reflection. (Also there was a big problem in the original version of this comic).įrequently, however, the right-angle transition at the base of the refractor telescope is done with a prism (an "image erector"). There are other problems, though, with reflecting telescopes see details below. As Space Vampires (like earth vampires) are widely believed to be made up and thus unlikely to interest most stargazers, this complaint is superfluous, and the reflecting telescope effectively has no flaws in comparison to the refracting telescope. ![]() The unstated reason for this is that vampires, according to some cultures, cannot be seen in a mirror. However, the punchline invalidates these complaints with the (apparently major) flaw listed with the reflecting telescope: It can't see space vampires. It first looks like the comic is simply trying to show that refracting has many flaws, such as expense, size and visibility (see more details below). (A third type, the catadioptric system telescope, uses both mirrors and lenses. A refracting telescope produces an image with a series of lenses. This comic compares two major types of optical telescopes: The refracting telescope and the reflecting telescope. Title text: On the other hand, the refractor's limited light-gathering means it's unable to make out shadow people or the dark god Chernabog.
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