Atelevision camera lens has a 17-cm focal length and a lens diameter of 6.0 cm. what is its number?

= 2.83

Explanation:

F number (N) is given by the formula;

  F- number = f/D

where f = focal length of lens and D = diameter of the aperture  

Therefore;

F number = 17 cm/6 cm

                = 2.83

e) none of the above answers are correct

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therefore to conclude i would like to say that,

=more the cloud cover, the lesser the

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