1.

What is the IFOV for a collimating lens of diameter 100mm, the distance between the collimating lens and combiner glass=50mm, the distance between pilot eyes and combiner glass=400mm?(a) 25.0°(b) 12.6°(c) 28.0°(d) 14.2°The question was asked during an interview.The query is from Head Up Displays in chapter Displays and Man-Machine Interaction of Avionics

Answer»

The correct choice is (b) 12.6°

To elaborate: D=100mm, L=50+400 =450MM (Since L is the distance from the observer to the collimating LENS)

IFOV = 2 X tan^-1 (D/2L) =2 x tan^-1( 100/2×450) = 12.6803° ≈ 12.6°



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