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The ratio of the focal length to aperture is called the __________

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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

I had been asked this question in semester exam.

Query is from Stellar Sensor Design in division Celestial Navigation, Doppler and Altimeter Radars of Avionics

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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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