Question

Which of the following is the correct relation between photographic scale ($S$) and focal length ($f$) of the camera lens?

• A. $S \propto f$
• B. $S \propto (1/f)$
• C. $S \propto f^2$
• D. $S \propto (1/f^2)$

Hint:

Photographic scale $S \propto f$; longer focal length increases the scale for a given height.

Answer 1

The Correct Option is A

The photographic scale ($S$) of an aerial camera is directly proportional to the focal length ($f$) of the camera lens: - $S = f / H$, where $H$ is the height above the ground, so $S \propto f$ when $H$ is constant. - Other relations do not align with the standard formula for photographic scale.