Tripling the Focal Length in a Telephoto Lens,while Keeping the Aperture

question 78

Multiple Choice

Tripling the focal length in a telephoto lens,while keeping the aperture size constant,will change the f-number by what factor?

• A)1/9
• B)1/3
• C)3
• D)9
• E)​1/6

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Definitions:

Maximum

The highest allowable limit for a dimension, value, or quantity.

Minimum

The lowest value or amount permissible or possible in a given set of conditions or contexts, often referred to in design, mathematics, and statistics.

Diameter Symbol

A symbol (∅) used in technical drawings to indicate that a dimension applies to a circle's diameter.

Limit Dimensions

The specifications on a drawing that show the maximum and minimum size limits that a part can be manufactured to.