How can you find the focal length of a lens? Does the type of lens matter? This is a super simple procedure measure a lens' focal length. Comparing lenses of different focal lengths is easy using this activity. 
 
Questions Answered:
How do you find the focal length of a lens? 
How does the image from a lens with a long focal length compare to one with a short focal length?
 
Topics Addressed:
Convex lenses make real images. 
The focal length of lenses can be measured using their ability to make images. 
Lenses with long focal lengths make larger, dimmer images than those with shorter focal lengths.
 
Learn to use scientific equipment:
Converging (convex) lenses
 
Skills and Tasks involved:
Find the focal length of convergent lenses. 
 
Materials Needed
convex lens, concave lens, convex mirror, concave mirror
 
Preparation Time
none needed
 
NOTE: This activity is part of the Light, Optics, & Color Unit found here.

Answer Keys and Teacher Notes address most questions and issues that might arise in this study—you shouldn’t have to do any outside research unless you want to.

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Connect with me: If you have questions or problems, please let me know and I’ll get back to you as soon as I can.

 

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