noun
magnification ratio; magnification power
Technical term used in optics, photography, microscopy, and similar fields to express how much an image is enlarged relative to the original.
この顕微鏡の拡大率は最大で1000倍です。
The magnification power of this microscope is up to 1000x.
写真を印刷するときは拡大率を確認してください。
Please check the magnification ratio when printing the photo.