Question

Find the f-number of a telescope with an objective diameter of 8.0 cm and a focal...

Find the f-number of a telescope with an objective diameter of 8.0 cm and a focal length of 95 cm.

Find the aperture diameter of an f/1.5 all-sky meteor camera lens with a focal length of 2.0 mm.

Homework Answers

Answer #1

1)The f-number(f/stop) of an optical system is the ratio of the system's focal length to the diameter of the entrance pupil. It is a dimensionless number that is a quantitative measure of lens speed. It is always represented as f/number.

f/number =Focal Length of the Telescope/ Objective(Aperture) Diameter

  

The answer for f/number is f/11.875

2) Using the same formula from above

Aperture Diameter = Focal Length of the Camera Lens / (f/number) Note- f/number is a single term

  

Therefore the Aperture Diameter is 1.333 mm.

We should know that objective diameter and the aperture diameter are the one and same things

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