The ratio of the focal length to the size of the aperture is known as F-number.

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Multiple Choice

The ratio of the focal length to the size of the aperture is known as F-number.

Explanation:
The F-number is defined as the ratio of the focal length to the aperture diameter (f/D). This compact value describes how much light the lens can gather and also how the depth of field will behave: a smaller F-number means a larger opening, more light, and a shallower depth of field; a larger F-number means a smaller opening, less light, and a deeper depth of field. The other options aren’t the standard name for this ratio; one is a nonstandard label, and another describes the effect (depth of field) rather than the ratio itself.

The F-number is defined as the ratio of the focal length to the aperture diameter (f/D). This compact value describes how much light the lens can gather and also how the depth of field will behave: a smaller F-number means a larger opening, more light, and a shallower depth of field; a larger F-number means a smaller opening, less light, and a deeper depth of field. The other options aren’t the standard name for this ratio; one is a nonstandard label, and another describes the effect (depth of field) rather than the ratio itself.

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