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"I sent CoolStuff to a new teacher I'm
mentoring. I use CoolStuff all the time and love it. The kids love it and learn from it!"
~ Dixie D. from Texas
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Lab #27.7
Light: Pinhole Camera
Purpose
In this activity,
students will observe images
formed by a simple convex lens
and compare cameras with and
without a lens.
Discussion
The first
camera used a pinhole
opening to let light in.
Because the hole is so
small, light rays that enter
cannot overlap. This is why
a clear image is formed on
the inner back wall of the
camera. Because the opening
was small, a long time was
required to expose the film
sufficiently. A lens allows
more light to pass through
and still focus the light
onto the film. Cameras with
lenses require much less
time for exposure, and the
pictures came to be called
“snapshots.”
Required Equipment
Covered shoebox,
25-mm converging lens, tracing
paper, aluminum foil, masking
tape.
Download
Student Worksheet
Teacher Notes
Return to Lab Menu
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25 mm Lens |
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The "Shoebox",
"Tracing Paper", Aluminum Foil"
and "Masking Tape" required for this lab
are common items you may be
available to find or salvage. Each lab
group would need access to one
of each see lab detail for
specific use. |
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