Discussion
Statement I: Head-up display symbology is collimated at infinity.
Statement II: The eye would otherwise have to refocus between the symbols and the outside world.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. Head-up display symbology is collimated so the virtual image lies at optical infinity, matching the focus of the distant outside scene.
Without collimation the eye would have to accommodate between symbols a few feet away and a runway a mile away, taking a fraction of a second each time and defeating the purpose of putting the information in the forward field of view. Collimation also makes the symbology insensitive to small head movements, which is what allows conformal symbols to stay registered with the world.
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