23 cm × 23 cm photographs are taken from a flying height with a camera of focal length of 3600 m and 15.23 cm respectively. A parallax difference of 0.01 mm represents

d = (P × f) / H = (0.01 mm × 15.23 cm) / 3600 m

First, we need to convert all measurements to consistent units (either all in meters or all in millimeters). Let's convert the focal length to meters:

f = 15.23 cm = 0.1523 m

Now, we calculate d:

d = (0.01 mm × 0.1523 m) / 3600 m

d = (0.001523 m²) / 3600 m

d = 4.23 × 10^-7 m

If we convert this back to millimeters, we have:

d = 0.423 mm
approximately it is 1