1.

The ratio of the focal length to aperture is called the __________(a) Critical aperture(b) Effective aperture(c) Focal number(d) f/ numberI had been asked this question in semester exam.Query is from Stellar Sensor Design in division Celestial Navigation, Doppler and Altimeter Radars of Avionics

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.



Discussion

No Comment Found

Related InterviewSolutions