Determine the focal length of this camera
The focal length of the camera is 8mm.
The focal length of this camera is approximately 8.5mm. This can be determined by using the equation for focal length: focal length = 1/sqrt(s*(s-1)) where s is the semi-focal length. The semi-focal length in this case can be found by taking the length of the sides of the image projected onto the film: the semi-focal length = 8.5mm. Therefore, the focal length is 8.5mm.