Lenses and Focal Length--Science Experiments on Optics MINI BUNDLE

Grade Levels
6th - 8th
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    1. SOME OF THE SKILLS AND TASKS INVOLVED:• Use pinholes to show image formation.• Find the focal length of convergent lenses. • Use pigments to show subtractive color mixing.• Use colored lights to show additive color mixing.• Visually recognize the difference between concave and convex lenses. • Use l
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    3. SOME OF THE SKILLS AND TASKS INVOLVED:• Use pinholes to show image formation.• Find the focal length of convergent lenses. • Use pigments to show subtractive color mixing.• Use colored lights to show additive color mixing.• Visually recognize the difference between concave and convex lenses. • Use l
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    Description

    How do convex and concave lenses compare to each other? Have you ever used a magnifying lens to look at things far away? Did you know that some lenses flip images? Have you ever used a lens to cast an image on a wall? Watch your students become scientists as they dig into these fascinating questions.

    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 convex and concave lenses compare to each other?
    • How do convex and concave mirrors compare to each other?
    • What do curved lenses and curved mirrors have in common?
    • 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 or converging lenses act like concave or converging mirrors.
    • Concave or diverging lenses act like convex or diverging mirrors.
    • Objects appear different when viewed through convex lenses depending on how you hold them.
    • 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:

    Diverging and converging lenses and mirrors

    Skills and Tasks involved:

    Compare and contrast convex and concave lenses.

    Find the focal length of convergent lenses.

    Materials Needed

    Convex lenses of at least two different focal lengths, concave lens, convex mirror, concave mirror, metric measuring tape, white screen


    Preparation Time
    none needed

    Other resources
    To see companion curricular pieces click here

    Answer Key Included
    Extensive teacher notes address the many questions that come up. You shouldn’t have to do outside research on this topic unless you want to.

    Time Required
    30 minutes or longer for each of the two labs depending on how much of the written assignment you use.

    Total Pages
    10 pages
    Answer Key
    N/A
    Teaching Duration
    1 hour
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