Edexcel A Level Physics:复习笔记5.22 The Lens Equation

• This equation can be applied to all thin converging and diverging lenses
• The equation relates the focal length of the lens to the distances from the lens to the image and the object
• 
•  Where:
  • f = focal length (m)
  • v = image distance from lens (m)
  • u = object distance from lens (m)

• This equation only works for thin converging or diverging lenses
  • The values are positive if the image is real

Step 1: Write the known values

• • Distance from object to lens, u = 50.0 cm
  • Distance from image to lens, v = 75.0 cm

Step 2: Write the equation and substitute in the values

f = 30 cm