The ratio of the focal length to aperture is called the __________(a) Critical aperture(b) Effective aperture(c) Focal number(d) f/ number

The ratio of the focal length to aperture is called the __________(a)

1.	The ratio of the focal length to aperture is called the __________(a) Critical aperture(b) Effective aperture(c) Focal number(d) f/ number
Answer» Correct answer is (d) f/ number Easiest explanation: The ratio of focal length to aperture is called the f/ number. For example, an f/10 telescope may have a 30 in. focal length and a 3 in. aperture.

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The ratio of the focal length to aperture is called the __________(a) Critical aperture(b) Effective aperture(c) Focal number(d) f/ number

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