Suppose we replace the lens in the video with one that has a longer focal length. To keep the image sharp, we must move the screen away from (further) the lens. To achieve a crisp image, we need to increase the distance between the lens and the screen as we raise focal length.
The focal length of an optical system is the inverse of the system's optical power; it measures how powerfully the system converges or diverges light. A system with a positive focus length converges light, whereas a system with a negative focal length diverges light.
The angle of vision varies as the focal length changes. The bigger the area photographed, the broader the field of view and the shorter the focal length. The lesser the angle and the larger the subject seem, the longer the focal length.
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