

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 ≈í¬± - tan ≈í‚â§)/S | |