science

Reverse mirror

Reverse mirror is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Reverse mirror rather than just read about it. In short: In television (typically sports broadcasting), a reverse mirror refers to a situation in which two national television channels have their signals split regionally, such that each of two programs will be available in all (or almost all) regions on one of the two channels, but will not air on the same channel in both regions. As an example, consider the following situation: Two games, Game 1 and Game 2, are being pla…

Key takeaways

Reverse mirror belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Reverse mirror to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Reverse mirror from memory before moving on to harder problems.

Reference excerpt

In television (typically sports broadcasting), a reverse mirror refers to a situation in which two national television channels have their signals split regionally, such that each of two programs will be available in all (or almost all) regions on one of the two channels, but will not air on the same channel in both regions. As an example, consider the following situation:

Two games, Game 1 and Game 2, are being played simultaneously. The broadcast rights to both games are owned by the same company, which also controls both Channel A and Channel B, and there are no restrictions on airing both games in the same location. Channel A reaches more viewers than Channel B (for example, Channel A may be a broadcast network whereas Channel B might be a cable channel). Alternatively, other considerations, such as Canadian simultaneous substitution regulations, may make it more advantageous for Channel A to carry a particular game in a particular region. In Region X, Game 1 is determined to be of greater interest to viewers (or more advantageous to air on Channel A), while in Region Y, the same applies to Game 2. Then in Region X, Game 1 will air on Channel A, and Game 2 will air on Channel B. In Region Y, these will be reversed: Game 2 will air on Channel A, and Game 1 will air on Channel B. This is usually accomplished by sending different feeds to the individual stations or cable companies transmitting the signals of each channel. Note that simply "splitting the network" between multiple regional games (e.g. Sunday afternoon NFL games in the U.S.) is not a reverse mirror, since there is no alternate channel on which a secondary game from the same network can air (apart from premium pay-per-view packages such as NFL Sunday Ticket).

Examples Saturday afternoon college football broadcasts on ABC (broadcast) and ESPN2 (cable) In some cases, the ABC network will be split between three or more games. In these cases, the "best" game not being broadcast locally on ABC will air on ESPN2, and the remaining game(s) will be limited to online streaming via ESPN3. "Late window" Sunday afternoon NFL broadcasts in Canada, on Citytv (broadcast) and Rogers Sportsnet (cable), from 2010 to 2013 From 2001 to 2005, Major League Baseball scheduled the League Championship Series such that both series had games played simultaneously on a single night. The game deemed to be of greatest interest in a particular market (including, invariably, the home markets of the teams involved) would air on Fox (broadcast), while FX (cable) would air the remaining game in that market.

References

Worked examples

Example 1 — a first encounter with Reverse mirror

Start with the simplest possible case. Write down what Reverse mirror claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Reverse mirror before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Reverse mirror ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Reverse mirror

In research: Reverse mirror appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Reverse mirror in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Reverse mirror is common in secondary-school and first-year university syllabi. It links to neighbouring topics Television terminology, so understanding it makes those chapters shorter.
In everyday life: Look for Reverse mirror outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Reverse mirror in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Reverse mirror means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Reverse mirror out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Reverse mirror in simple terms?

Why does Reverse mirror matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Reverse mirror?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Reverse mirror.