Refraction of Light The drawing indicates that compared to blue light, red light moves A. faster in glass. B.slower in glass. C.the same speed in glass. The drawing indicates that compared to blue light, red light moves A. faster in glass. B.slower in glass. C.the same speed in glass.

Refraction of Light The refracted angle is: ______________

Part I Research 1. Research the term refraction and write a description of this effect. 2. Research the term index of refraction and write a description of this number. Describe what a low and high index indicate. 3. Research Snell’s Law, the equation that governs refraction of light. Write the equation and sketch a picture of light moving from air to glass. Show and Label: the normal, the incident ray and incident angle, the refracted ray and refracted angle, and the reflected ray and angle. Use a ruler and draw carefully. Hand this in by the end of the class period.

Part II Phet Experiment Design an experiment to investigate Snell’s Law by using the “ Bending Light” Phet simulation. 1. Investigate a light ray moving from air to water by measuring the incident and refracted angles for 5 degrees to 90 degrees in 5 degree increments. 2. Plot the sine of the incident angle vs. the sine of the refracted angle. Use your plot to determine the index of refraction for water. 3. Repeat for a ray moving from air to glass.

Data Tables Incident AngleRefracted Angle Incident AngleRefracted Angle Air to WaterAir to Glass

Graphing Tables Sine of Incident Angle Sine of Refracted Angle Sine of Incident Angle Sine of Refracted Angle Air to WaterAir to Glass Use degree mode. Slope of linear fit = index of refraction for 2 nd medium.

1. Set the clear block on a piece of paper and trace its outline. 2.Send a ray of light through the block and then then trace its path on the paper. 3.Use a protractor and measure and record the angle of incidence and refraction. 4.Using Snell’s Law, find the index of refraction for the block. 5.Repeat for a new incident angle. Part III Ray Box Experiment

Questions 1. Using the simulation, investigate a ray coming from water, into glass. What happens when the incident angle is near or below 47 degrees? Look carefully. 2. What is meant by the “critical angle “ for light that moves from a higher index to a lower index? 3. Find the index of refraction for “mystery material A”, using Snell’s Law.

A.Starters B.Three Research Questions with Diagram C.Two Data Tables with Calculated Index of Refraction D.Two Ray Box Diagrams with Measured Angles and Snell’s Law Calculations E. Questions – Written out and answered F. Summary A.Starters B.Three Research Questions with Diagram C.Two Data Tables with Calculated Index of Refraction D.Two Ray Box Diagrams with Measured Angles and Snell’s Law Calculations E. Questions – Written out and answered F. Summary