41. The longitudes of two places at latitude 60° N are 93° E and 97° W. Their departure is
42. The distance between the minor control point and the principal point should be equal to
43. The meridian of a place is
44. The coverage is least if photography is
45. Rotation of the camera at exposure about horizontal axis normal to the line of flight, is known as
46. The principal line is the line joining the principal point and
47. The product of the distances of plumb point and horizon point of a vertical photograph from its principal point, is
48. A series of closely spaced contour lines represents a
49. Places having same latitude
50. The sun's declination remains north between
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