Which of the following is the correct order for the path of light in a HUD?(a) CRT -> mirror -> collimating lens -> combiner glass -> pilot(b) CRT -> collimating lens -> mirror -> combiner glass -> pilot(c) CRT -> mirror -> combiner glass -> collimating lens -> pilot(d) Collimating lens -> CRT -> mirror -> combiner glass -> pilotThe question was posed to me in an internship interview.My question is taken from Head Up Displays topic in chapter Displays and Man-Machine Interaction of Avionics

Which of the following is the correct order for the path of light in a

1.	Which of the following is the correct order for the path of light in a HUD?(a) CRT -> mirror -> collimating lens -> combiner glass -> pilot(b) CRT -> collimating lens -> mirror -> combiner glass -> pilot(c) CRT -> mirror -> combiner glass -> collimating lens -> pilot(d) Collimating lens -> CRT -> mirror -> combiner glass -> pilotThe question was posed to me in an internship interview.My question is taken from Head Up Displays topic in chapter Displays and Man-Machine Interaction of Avionics
Answer» Correct answer is (a) CRT -> mirror -> collimating lens -> combiner glass -> PILOT The best explanation: The symbols and flight parameters are generated and magnified by the CRT (Cathode Ray Tube) and is reflected almost 90° by a mirror. The reflected rays are passed through a collimating lens which produces a PARALLEL ray of LIGHT with focus at infinity. The collimated rays are then displayed in a combiner glass which COMBINES the outside world picture with the flight parameters generated to be viewed by the pilot.

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