Explain focal length.
Answers
Focal Length
The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light. A system with a shorter focal length bends the rays more sharply, bringing them to a focus in a shorter distance or diverging them more quickly. For the special case of a thin lens in air, a positive focal length is the distance over which initially collimated (parallel) rays are brought to a focus, or alternatively a negative focal length indicates how far in front of the lens a point source must be located to form a collimated beam. For more general optical systems, the focal length has no intuitive meaning; it is simply the inverse of the system's optical power.
Answer:
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Explanation:
Many photographers misunderstand the concept of focal length. Contrary to what some people think, the focal length of a lens is not the lens’s physical dimension and it has little to do with its overall size. So, what is it then? In this article, I will answer that question and discuss how to decide which focal length is right for your style of photography.