Light Refraction through Objects: Experiment and Results

1. Lesson 2 - Starter Question Which “colour” is created because a surface ABSORBS light?

2. Lesson 2 • Define refraction. 2. Be able to draw diagrams of light refracting through objects.

3. Experiment Aim To study the refraction of light.

4. Normal line Method i Angle of Incidence Sheet of Paper Ray box with single slit Glass block • Draw around the glass block. 2. Draw a straight line along which the ray of light will travel. 3. Draw in the normal. 4. Measure the angle of incidence, i. 5. Switch on the ray box.

5. Normal line r Method Angle of Incidence i Sheet of Paper Angle of Refraction Ray box with single slit Glass block 6. Draw in the refracted ray as it leaves the glass block. 7. Switch off the ray box, remove the glass block and complete the path of the ray. 8. Measure the angle of refraction. 9. Repeat for different shapes of glass block.

6. Copy! i = angle of incidence ro = angle of refraction This ray is parallel to the original incident ray. Results – Rectangular Block yo io = y x xo ro = r i A ray parallel to the normal will pass straight through the block.

7. Copy! Results – Triangular Block The ray bends towards the normal going into the block and away from the normal going out of the block.

8. Copy! Results – Semicircular Block The ray bends towards the normal going into the block. The ray will pass straight through the curved edge as it will strike parallel to the normal at that point.

9. Copy! Conclusion – Refraction Refraction is when light moves from one material to another (known as a medium) and changes speed. This is usually accompanied by a change in direction. Manipulating Light Video Clip

10. 2003

11. 2006