Problem a lens of focal length 45 mm is mounted on a 35 mm, Ask an Expert

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Problem: A lens of focal length 45 mm is mounted on a 35 mm camera. The lens aperture is set at f/2 and the shutter speed set at 1/2000 s.

Part A- Find the aperture diameter, in mm?

I need the accurate answer and steps of solving this problem. Thanks!

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