The magnification ratio — the factor by which an image or object is enlarged (or reduced). Often used for microscopes, cameras, and printing.
顕微鏡の拡大率は40倍だ。
The microscope's magnification is 40x.
カメラのズームで拡大率を上げると、遠くの被写体が大きく写る。
If you increase the camera's zoom (magnification), distant subjects appear larger in the photo.
写真を印刷する前に拡大率を調整してください。
Please adjust the magnification ratio before printing the photo.