On the first quiz, I learned that the speed of a lens refers to the maximum diameter of its aperture (or the minimum f-stop number) of a camera lens. I also learned that flash sync refers to synchronizing the flash of a camera with the subsequent opening of its shutter to allow light in. I don't know how many questions I got right, but I received a "pro" rating on the quiz.
On the second quiz, I learned that shutter speed can be used not only to create a pleasing blur in the photograph, but also to help correctly expose a dark area. I also learned that the f-stop is the ratio between the aperture and the focal length of the lens; so a longer lens needs a wider opening to achieve the same ratio. On the second quiz, I answered 18 out of 22 questions correctly.
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