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

ANSWER DOWNLOAD EXAMIANS APP

Surveying
In the prismatic compass

the magnetic needle and graduated circle do not move with the box
the magnetic needle moves with the box
the line of the sight does not move with the box
the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction

ANSWER DOWNLOAD EXAMIANS APP