7 Set up your ray box for a single ray and use the diagrams below to direct

7 set up your ray box for a single ray and use the

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7. Set up your ray box for a single ray and use the diagrams below to direct your rays. 8. Complete each of the following diagrams by marking the path of the refracted ray for the given incident rays and complete the summaries: Part C: Diverging (Concave) Lenses 1. Repeat steps 1 to 4 above using a diverging lens. 2. How do you locate the focal point for this lens? 3. Measure the focal length of your lens. Focal length = _______________ 4. Make a neatly labelled diagram of the convex lens showing the principal axis, the vertex, focal point, focal length, incident rays and refracted rays. Concave Lens Incident rays parallel to the principle axis are refracted in such a way that the refracted rays … Incident rays passing through the vertex are refracted in such a way that the refracted rays Incident rays passing through F are refracted in such a way that the refracted rays … 42
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Converging and Diverging Lenses What are lenses? Lenses are used to ___________ light and form ____________. There are a variety of possible types We will consider only the _______________ ones o the double ___________ and the double _____________ Converging at the Focal Point For a double convex (i.e. _____________) lens, the light refracts such that it converges at the focal point. Diverging from the Focal Point A double concave (i.e. ______________) lens has the refracted rays diverging as if they all come from the focal point. Constructing Ray Diagrams Draw of the principal rays originating from the same on the object and follow these rules: 1. P-Ray is drawn through a point on the object and _____________ to the principal axis . o It is refracted through the ___________________, F . 2. F-Ray is drawn through a point on the object and through (convex) or towards (concave) the _________________. o it is refracted ______________ to the principal axis. 3. V-Ray is drawn through a point on the object and through the ____________. o It goes straight ___________ and does NOT change ___________ (assuming lens is thin) 43
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Converging Lenses Converging = ______________ The convex lens forms different image types depending on where the object is located with respect to the __________________ 5 possible object locations 1. Case 1: The object is located in front of F 2. Case 2: The object is located at 2 F 3. Case 3: The object is located beyond 2 F 4. Case 4: The object is located between F and 2 F 5. Case 5: The object is located at F , the focal point. Please complete handout for CONVEX lenses (front half) (two examples are done for you on the next slides to help get you started) Diverging Lenses Diverging = _______________ Complete the ray diagrams for concave/diverging lenses You only need to complete two or three of these … if you catch on to the trend, you can stop Summary: Image Characteristics formed by Concave and Convex Lenses Concave Lens (Diverging) Object Location Size Attitude Location Type Arbitrary Convex Lenses (Converging) Object Location Size Attitude Location Type Beyond 2F At 2F Between F and 2F At F In front of F Homework Complete ray diagrams and fill in table above 44
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Science, Gr. 10 Light and Geometric Optics Images in Lenses How Images Are Formed by Converging Lenses Case 1: Object beyond 2F’ Case 2: Object at 2F’ Case 3: Object between F’ and 2F’ Case 4: Object at F
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  • Spring '14
  • Light, Total internal reflection, Geometrical optics, rays

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