61. The prime vertical passes through
62. The relation between the air base (B), photographic base (b), flying height (H) and the focal length (f) of a vertical photograph, is
63. The principal plane contains
64. Latitude of the observer's position is equal to altitude of
65. The parallax equation $$\Delta {\text{p}} = \frac{{{\text{Bm}}\Delta {\text{h}}}}{{{\text{H}} - {\text{h}}}}$$ is applicable to entire overlap of the photographs only if parallax is measured
66. If the length of a chain is found to be short on testing, it can be adjusted by
67. In the double application of principle of reversion, the apparent error is
68. The solar tidal force divided by lunar tidal force is
69. Closed contours, with higher value inwards, represent a
70. The average eye base is assumed as
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