 Learning Objective › Explain the relationship between the focal length, image distance, image size, and object distance for a convex lens.  Success.

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Presentation transcript:

 Learning Objective › Explain the relationship between the focal length, image distance, image size, and object distance for a convex lens.  Success Criteria › Observe real images formed by a convex lens › Project a slide using a lens › Relate image size and position to object size and position and the properties of your lens  Do Now: › Write LO and SC on new left page › p 567 WDYS/WDYT  Agenda › Do Now › Investigate 5.9 › Summary

 #1-3  #4  #5-9  #10  Students investigate with convex lens  Teacher demo  Students explore and measure (create table)  See teacher for additional lens

 Learning Objective › Explain the relationship between the focal length, image distance, image size, and object distance for a convex lens.  Success Criteria › Observe real images formed by a convex lens › Project a slide using a lens › Relate image size and position to object size and position and the properties of your lens  Do Now: › How can you produce a large image from the lens? How do you produce a small image?  Agenda › Do Now › Physics Talk › Summary

 What are lenses used for?  What is a convex lens?  Projectors, microscopes, and binoculars  A lens that is thicker in the middle and thinner towards the edges

 What happens to rays the enter the convex lens parallel to the principal axis?  What is another name for a convex lens?  These rays will converge at the focal point on the other side.  Converging lens, because the rays all converge at one point (focal point).

 How is an image formed through a lens?  Examples  The object reflects light through the lens, an image can form.  Objects from outside  Arrow from index card

 There are 2 rays required 1. The ray from the top of the object, parallel to the principal axis, and through the focal point 2. The ray that goes through the middle of the lens undeflected

 How are large images produced? (i.e. movie projectors)  The film is put very close to the focal point of the lens and placed upside- down.

 How are small images produces? (i.e. digital cameras)  How are same-size images produced? (i.e. copy machines)  The object is very far away from the lens, so a much smaller image is produced.  The image is placed at a distance that will produce an identical image

 What kind of image is produced if the object is close to the lens?  Virtual – the image appears to be coming from the same size as the object. This is how a magnifying glass works!

 Use the rays listed before to find the image 1. Top, parallel, through focal point 2. Straight through middle

 Pg. 573 › What does it mean? › How do you know? › Why should you care?  LO and SC Reflection