Part 2 Directions: Get three index cards or small card boards. Punch a hole near the top of each index cards or small card boards. All three cards must have a hole that is lined up later. Tape the card board to blocks or small objects to make them stand upright. See the three cards up in a row and shine flashlight through them, https://www.ducksters.com/science/experiment_light_travel.php 1. What have you notice? 2. Now, move one of the cards slightly out of the line. What happens?
