α and β are the angles subtended by a point of elevation h at their – McqOptions

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1.	α and β are the angles subtended by a point of elevation h at their air station with respective plumb points. Photo scale and focal length of the lens being ‘S’ and ‘f’ respectively. Parallax displacement of the point due to relief, is
A.	tan α/S
B.	tan β/S
C.	(tan α + tan β)/S
D.	(tan α - tan β)/S
Answer» D. (tan α - tan β)/S

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