13.3 Images in Lenses.

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Presentation transcript:

13.3 Images in Lenses

Sideways Displacement in a rectangular prism The emergent ray will always be parallel to the incident ray, but displaced sideways. The amount of displacement depends on the thickness of the prism. See Fig. 1 p. 557

Relevance? This is the same with lenses. The greater the thickness, or curvature, the greater the refraction.

Rules for Locating the Image in a Converging Lens A ray parallel to the principal axis is refracted through the principal focus. A ray through the secondary principal focus (F’) is refracted parallel to the principal axis. A ray through the optical centre continues straight through.

Images in a Converging Lens Case 1: Beyond 2F’ Case 2: At 2F’ Case 3: Between 2F’ and F’ Case 4: At F’ Case 5: Inside F’

Case 1: Beyond 2F’

Case 2: At 2F’

Case 3: Between 2F’ and F’

Case 4: At F’

Case 5: Inside F’

Summary

Imaging Properties of a Converging Lens (Table 1, pg 559) Object Image Location Size Attitude Type Beyond 2F’ At 2F’ Between 2F’ and F’ At F’ Inside F’ Between 2F and F Smaller Inverted Real Same Inverted At 2F Real Larger Inverted Beyond 2F Real No Clear Image Same Side as object Larger Upright Virtual

Images in a Diverging Lens A diverging lens always produces the same image characteristics no matter where the object is. Always smaller, upright, on the same side of the lens as the object, and virtual.

Rules for Locating the Image in a Diverging Lens (pg 559) A ray parallel to the principal axis is refracted as if it had come through the principal focus (F). A ray that appears to pass through the secondary principal focus (F’) is refracted parallel to the principal axis. A ray through the optical centre continues straight on its path.

Beyond 2F Between 2F&F At F

Image is always smaller, upright, same side as object, virtual Summary Image is always smaller, upright, same side as object, virtual

Classwork........ p. 561 # 1 – 5