Finding the Focal Length of a Lens Using the Ray Box

This Finding the Focal Length of a Lens Using the Ray Box lesson plan also includes:

The iPhone 7 has double the focal length on the secondary camera than the iPhone 6, but what is focal length? The fifth lesson in an 11-part series teaches scholars to solve for focal length of a lens using a ray box. After finding the object distance and image distance, pupils apply the lens equation and plot a graph to determine the focal length of the lens they are testing.

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CCSS: Adaptable
Instructional Ideas

  • All measurements should be repeated and averaged
Classroom Considerations

  • Ideal for small groups with only two to three students per group
  • Each group needs to use a ray box with illuminated object
Pros

  • Offers sample assessment questions with ideal answers
  • Includes two extension ideas 
Cons

  • None
Common Core