College Physics I – Introduction

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Image distance

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College Physics I – Introduction

Definition

Image distance is the distance between the image formed by a lens and the lens itself. It is usually denoted by $d_i$ and can be positive or negative depending on the type of image formed.

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5 Must Know Facts For Your Next Test

  1. The sign of the image distance ($d_i$) indicates whether the image is real (positive $d_i$) or virtual (negative $d_i$).
  2. Image distance can be calculated using the lens equation: $\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i}$, where $f$ is the focal length and $d_o$ is the object distance.
  3. In a converging lens, a real image forms on the opposite side of the object, making $d_i$ positive.
  4. In a diverging lens, a virtual image forms on the same side as the object, making $d_i$ negative.
  5. The magnification of an image can be found using $\text{Magnification} = -\frac{d_i}{d_o}$.

Review Questions

  • How do you determine if an image is real or virtual based on its image distance?
  • What does a positive value for image distance signify in terms of image formation?
  • How would you use the lens equation to solve for an unknown image distance?

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