What are the differences between a 300mm and a 400mm lens in terms of focal length and how do these differences impact photography?

A 300mm lens has a shorter focal length than a 400mm lens, meaning it captures a wider field of view. The 400mm lens, on the other hand, has a longer focal length and captures a narrower field of view, allowing for more magnification of distant subjects. This impacts Photography by giving the photographer more flexibility in framing shots and capturing details from a distance.