Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What does a ray model of a pinhole camera look like?
   • http://www.cbakken.net/obookshelf/camera.html
2. With photosensitive paper where does light transfer from and to?
   • Light transfers Energy from source to absorber.
3. What things can absorbed light energy do in a polaroid camera lead to?
   • The Energy absorbed can lead to chemical effects such as photosensitive chemicals in photo films.
4. What can absorbed light energy lead to in the eye?
   • The Energy absorbed can lead to chemical changes in Cells such as those in the back of the eye.- the retinia.
5. How does a pinhole camera create a faint image that is in focus?
   • A pinhole camera creates a faint image that is in focus because only a single ray can enter the camera so there is not much light so the image is dim, but only image is formed so it is clear (focused) image.
6. What can happen to a charged surface when light energy is absorbed?
   • When light is absorbed by a charged surface, the charge can leak away.
7. Why does having three small holes in a pinhole give three faint images that are in focus?
   • With three small holes, a pinhole camera gives three faint image that are in focus. It works in the same way as a single hole, but a different angle so the images are offset from each other.
8. Where is the light reflected in the eye?
   • Light is refracted first by the cornea and then by the lens.
9. How can a picture be made using a CCD?
   • If a charged pixel is exposed to light, then the charge can be measured by a circuit to indirectly measure the amount of light that had fallen on it.
10. How does a bigger hole effect the image produced?
    • A big hole can be thought of as thousands of small holes joined together. So thousand of images are produced on the screen slightly offset from one another forming a blurred, out of focused image.