Surveying
The relation between the air base (B), photographic base (b), flying height (H) and the focal length (f) of a vertical photograph, is

B = bH/f
B =f/bH
B = H/bf
B = b/fH

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Surveying
Spring tides are caused when

None of these
Solar tidal force and lunar tidal force both coincide
Solar tidal force acts opposite to lunar tidal force
Sun and moon are in line with earth

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