Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
On 4/12/07, Anthony Lapinski <Anthony_Lapinski@pds.org> wrote:
...
I am thinking it would be a good way to show students that light travels
in straight lines, and to introduce them to real images (rather than begin
with virtual images in a plane mirror).
Could you make the argument that what is formed by a pinhole camera
isn't really an image (real or not)? There is no coherent
recombination of light rays in a pinhole camera, just divergence. What
appears on the screen is more like a complicated shadow than an image
in terms of how it is formed.
With an actual real image formed by a lens, you can remove the screen
and still see the image if your eye is lined up with the object and
the lens. You cannot do this with a pinhole camera.
Sorry that doesn't help you with your query (others have already
helped there... I'm hungry for oatmeal cookies now!).
_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l