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WikiCards · Card list · Science cards · Cassegrain reflector
Uncommon card · Science
Cassegrain reflector, an Uncommon card
A Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture.
- Rarity
- Uncommon
- Domain
- Science
- ATK
- 60
- DEF
- 52
- Power
- 112
- Wikipedia reads a year
- 31,000
Power 112 (ATK + DEF): stronger than 60 % of WikiCards cards.
Cassegrain reflector quiz: 3 questions
Three questions on the Cassegrain reflector card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
Alternatively, as in many radio telescopes, the final focus may be in front of the ______.
Answer
primary. Alternatively, as in many radio telescopes, the final focus may be in front of the primary. From the Cassegrain reflector article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Internal energy. Internal energy 71 · Antenna array 68 · 51 Pegasi b 64 · Cassegrain reflector 60 ATK in WikiCards.
Which of these Wikipedia articles is read the most in a year?
Answer
Internal energy. Internal energy 70,000 · E-segment 56,000 · Cassegrain reflector 31,000 · Charles Hermite 22,000 Wikipedia reads over a year.
In a duel, each round asks a question like these about the opposing card, with 15 seconds to answer.
The facts on the card
The card carries these facts from its Wikipedia article.
- This design puts the focal point at a convenient location behind the primary mirror and the convex secondary adds a telephoto effect creating a much longer focal length in a mechanically short system.
- In a symmetrical Cassegrain both mirrors are aligned about the optical axis, and the primary mirror usually contains a hole in the center, thus permitting the light to reach an eyepiece, a camera, or an image sensor.
- Alternatively, as in many radio telescopes, the final focus may be in front of the primary.
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Cassegrain reflector article was read about 31,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 60 and blocks with 52: each hit it takes is cut by 21 %.
How to get Cassegrain reflector
Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.
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The cards just above and just below Cassegrain reflector in the power ranking, all domains together.
- Frederick Jackson TurnerUncommon · History · ATK 68 DEF 44
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- Allotropes of oxygenUncommon · Science · ATK 60 DEF 52
- History of the British national debtUncommon · History · ATK 62 DEF 50
- SwellendamUncommon · Society · ATK 64 DEF 48
Card lists
- Wikipedia quizNew questions every day
- All cards from A to ZEvery card, by name
- Science cards
- Legendary cards
- Tier listS and A tiers by power (ATK + DEF)
Credits
Text : Wikipedia, Cassegrain reflector (revision), CC BY-SA 4.0. Photo : Szőcs Tamás Tamasflex, CC BY-SA 3.0, Wikimedia Commons.
