-First, they made sure that the distance between the cardboard with the hole and the white piece of paper was about 1 meter.
-Next, they measured the diameter of the image of light that appeared on the white paper. (About 1 cm.) They were also told how far away the sun was from earth. (About 100 million miles)
-Then, they drew a picture to help them conceptualize the geometrical processes that were occurring. Their pictures looked similar to the pictures they had drawn in previous days to explain pinhole phenomena. They included light traveling in straight lines through a pinhole and ending up at an image of the original light source.
-Then, by inserting the numbers they already had onto their pictures, they devised a formula for determining the number that they did not know (the diameter of the sun).
-Finally, by using basic algebra skills, students determined the only variable they did not know (the diameter of the sun). They found that the diameter of the sun must be about 1 million miles.
-Afterward, the small groups of students presented their white board findings to the other groups in class. Their white boards included information such as ray diagrams, predictions, comparisons with observations, powerful ideas about light, etc. | |