(Optional) Model additional types of wave patterns from Table 5.2.Repeat Part B Step 1 for both refraction and diffraction.Draw a diagram of your final setup for demonstrating reflection.Test your predictions and refine your methods until you are able to demonstrate reflection.Predict how you can demonstrate reflection.Using the ripple tank and waterproof objects, create wave patterns that demonstrate reflection.Demonstrate reflection, refractions and diffraction. Observe the waves propagating across the tank from each X.Use a metronome to help you tap the water at the same rate and time. Practice creating identical wave patterns with your partner by tapping on the surface of the water above each X.Draw a diagram of what the wave pattern will look like from above the tank. The decrease in speed upon entry of light into a water droplet causes a bending of the path of light towards the normal. Using your knowledge of wave properties, predict what will happen when you and a partner tap the water at the X’s to create waves in the ripple tank. Light waves refract when they cross over the boundary from one medium to another.
Using a grease pencil or marker, place two “X†marks on the bottom of the tank along a center line at one-quarter and three-quarters of the way across the tank (Fig. Measure length of the tank with a ruler.Destructive interference occurs when the crests from one wave set and the troughs from another wave set meet, and the waves cancel each other out. Constructive interference occurs when the wave crests and troughs meet, increasing the amplitude of the combined wave. Recall from the topic Sea States in the unit Waves that interference occurs when two or more wave sets meet.
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