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.	h tan α/S
B.	h tan β/S
C.	h (tan α + tan β)/S
D.	h (tan α - tan β)/S
Answer» D. h (tan α - tan β)/S

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