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Physics 1161 – Lecture 23 Lenses. Lens Equations convex: f > 0; concave: f < 0 d o > 0 if object on left of lens d i > 0 if image on right of lens otherwise.

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Presentation on theme: "Physics 1161 – Lecture 23 Lenses. Lens Equations convex: f > 0; concave: f < 0 d o > 0 if object on left of lens d i > 0 if image on right of lens otherwise."— Presentation transcript:

1 Physics 1161 – Lecture 23 Lenses

2 Lens Equations convex: f > 0; concave: f < 0 d o > 0 if object on left of lens d i > 0 if image on right of lens otherwise d i < 0 h o & h i are positive if above principal axis; negative below dodo didi

3 Which way should you move object so image is real and reduced? 1.Closer to the lens 2.Farther from the lens 3.A converging lens can’t create a real, diminished image. F F Object P.A.

4 Which way should you move object so image is real and diminished? 1.Closer to the lens 2.Farther from the lens 3.A converging lens can’t create a real, diminished image. F F Object P.A.

5 ImageObject Image Object Image 3 Cases for Converging Lenses This could be used as a projector. Small slide on big screen This is a magnifying glass This could be used in a camera. Big object on small film Upright Enlarged Virtual Inverted Enlarged Real Inverted Reduced Real Inside F Past 2F Between F & 2F

6 1) Rays parallel to principal axis pass through focal point. 2) Rays through center of lens are not refracted. 3) Rays toward F emerge parallel to principal axis. Diverging Lens Principal Rays F F Object P.A. Image is (always true): Real or Imaginary Upright or Inverted Reduced or Enlarged

7 1) Rays parallel to principal axis pass through focal point. 2) Rays through center of lens are not refracted. 3) Rays toward F emerge parallel to principal axis. Diverging Lens Principal Rays F F Object P.A. Image is virtual, upright and reduced. Image

8 Which way should you move the object to cause the image to be real? 1.Closer to the lens 2.Farther from the lens 3.Diverging lenses can’t form real images F F Object P.A.

9 Which way should you move the object to cause the image to be real? 1.Closer to the lens 2.Farther from the lens 3.Diverging lenses can’t form real images F F Object P.A.


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