The f-number of camera is 4.5 which of t...

The `f`-number of camera is 4.5 which of the following is true ?

A

The focal length of the camera lens is 4.5 cm

B

Diameter of lens `= 4.5 xx` focal length

C

Focal length of lens `= 4.5 xx` diameter

D

Focal length of lens `= 4.5 xx` aperture.

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