Projector: slide 10.5 cm from a 10 cm lens

Answer: image distance = 210 cm (magnification -20 ×).

What we know

  • Focal length: 10 cm
  • Object distance: 10.5 cm

Step by step

Given
Focal length = 10 cm, Object distance = 10.5 cm
Formula
1/f = 1/dₒ + 1/dᵢ
Result
Image distance = 210 cm

All results

Image distance210 cm
Magnification-20 ×

Open the lens equation calculator with these numbers → and change any of them.

The physics

The thin lens equation links three distances: focal length (the lens's strength), object distance, and where the sharp image forms.