23.4 Index of Refraction
23.5 Refraction: Snell’s Law
23.6 Total Internal Reflection; Fiber Optics
23.7 Thin Lenses; Ray Tracing
23.8 The Thin Lens Equation; Magnification
Objectives:
a. Determine the index of refraction for various situations.
b. Show how the angle of refraction is related to Snell’s Law.
c. Draw light rays as they are refracted from one medium to another.
d. Demonstrate how total internal refraction occurs using a diagram and Snell’s
Law.
e. Trace the path of light rays as they pass through a diverging and converging
lens.
f. Using the thin lens equation, calculate several thin lens properties for
diverging and converging lenses.
Homework Problems: 23, 24, 26-31, 36-39, and 43-51 pp. 659-661
Vocabulary to Know for These Sections:
Index of refraction
Speed of light
Refraction
Snell’s Law
Law of refraction
Critical angle
Total internal reflection
Reflection
Fiber Optics
Axis
Focal Point
Thin lens
Converging lens
Diverging lens
Focal plane
Focal length
Power
Diopter
Real Image
Virtual Image
Thin lens equation
Positive lens
Negative lens
Formula Search For These Sections: (identify the variable and its units)
Index Of Refraction
What is the speed of light in a vacuum?
What happens to the speed of light in different mediums?
What is the index of refraction?
Describe the relationship of the index of refraction and wavelength.
Why does light move slower in mediums than a vacuum?
Refraction: Snell’s Law
What two things happen to a ray of light as it passes from one medium to another?
How is the light ray refracted as it passes into a less dense medium?
How is the light ray refracted as it passes into a denser medium?
How can refraction cause an optical illusion?
Explain how Snell’s law is related to the index of refraction.
Total Internal Reflection
How is the critical angle determined?
Draw a diagram show total internal reflection.
When does total internal reflection occur?
How is internal reflection used in tools and technology?
Thin Lens Tracing
What application exists for thin lenses?
Create a diagram that demonstrates the path of light through a converging lens.
(label all the parts of the diagram)
Compare and contrast converging and diverging lenses.
How is the power of a lens determined?
How is the unit of lens power determined?
Draw and explain how you can use three lines to create an image using a converging lens.
Describe the image produced by a converging lens.
Draw and explain how you can use three lines to create an image using a diverging lens.
Describe the image produced by a diverging lens.
The Thin Lens Equation
For what, is the thin lens equation used?
What are the sign conventions for lenses?
Compare and contrast positive and negative lenses
Review the Example Problems and prepare questions for class.