In: Other
An aerial camera has a 9½-inch square film format and a 6-inch focal length lens. What must the flying height (in meter) be to obtain a scale of 1/2000? (Hint: 1 inch=2.54 cm)
ANSWER
STEP 1
Given that focal length of the camera lens (f) = 6 inch = 6 *2.54 cm = 15.24 cm
Scale (S) = 1/2000 ( or it can also be written as 1 : 2000)
Let H be the flying height
Step 2
We know that
f/H = S
or, 15.24/H = 1/2000
Or, H = 15.24 *2000 =30480 cm
= 304.80 m
Therefore the required flying height (in meter ) is 304.80 meter