State and use the formula: magnification = image size ÷ actual size

The formula for magnification is a fundamental concept in microscopy and image analysis. It allows us to understand how much larger an image appears compared to the actual size of the object being observed. The formula is expressed as:

Magnification Formula

Components of the Formula

• Magnification: A dimensionless number that indicates how many times larger the image appears compared to the actual object.
• Image Size: The size of the image as seen through the microscope or imaging device, typically measured in millimeters (mm) or micrometers (µm).
• Actual Size: The true size of the object being observed, also measured in millimeters (mm) or micrometers (µm).

Example Usage

Suppose you have a microscopic image of a cell that measures 200 micrometers (µm) in length. If the actual size of the cell is 50 micrometers (µm), you can calculate the magnification as follows:

1. Identify Image Size and Actual Size:
   • Image Size = 200 µm
   • Actual Size = 50 µm
2. Apply the Formula:
   Magnification=200  m/50  m=4
3. Interpret the Result:
   • The magnification is 4, meaning that the image of the cell appears four times larger than its actual size.