Answer :
Final answer:
A narrower than usual runway will have the same appearance as an upsloping runway due to the visual slope illusion.
Explanation:
When you break out of the clouds on an instrument approach, a narrower than usual runway will have the same appearance as an upsloping runway. This is known as the runway's visual slope illusion, which occurs due to an optical illusion caused by the pilot's viewing angle. The narrower runway gives the impression that it is sloping upwards, even though it may actually be level or even downsloping.
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