What do you see without light?  In the absence of light, how much can you see?

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Presentation transcript:

What do you see without light?

 In the absence of light, how much can you see?

 If you are in a totally dark room (with no light at all) you will see nothing.

We changed the apple’s exposure to light.

 Take red apple  Turn off all lights  Block any light entering room (or closet) with tape, paper, towels, etc.  Enter room or closet with no windows  Wait for eyes to adjust

 Our hypothesis was correct.  You can see nothing without light  To see even a shadow or an outline, we need some light.

 Uncovering Student Ideas in Science 25 Assessment Probes by Keeley, Eberle and Farrin  Seamless Assessment in Science by Abell and Volkmann