## 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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