Optical Density, Light Speed, and n
The Optical Density, n, and Light Speed Video Tutorial discusses the relationship and logic that relate the optical density of a material to the speed of light in that material and to the index of refraction of the material.
The video lesson answers the following questions:
- How are the optical density of a material, the index of refraction of a material, and the speed of light in the material related?
Video
You can watch the video below, or click here to watch on YouTube (opens in a new tab).
To improve the effectiveness of the learning experience, The Physics Classroom has provided the following tools:
Additional and Related Learning Tools
Physics Interactive, Refraction and Lenses Chapter, Refraction Simulation
Our Refraction simulation allows you to explore the variables that impact the amount of refraction occuring at a boundary.
The Calculator Pad, Refraction and Lenses Chapter, Problem Set RL2
Need pratice using the n = c/v equation? We have a set of problems that provide feedback and extensive help in the form of audio files and written information. Give Problem Set RL2 a try.
The Physics Classroom Tutorial, Refraction and the Ray Model of Light, Lesson 1, Optical Density and Light Speed
Our written tutorial pages form the basis of most videos. So when you need a quick reference, the Tutorial page is a great place to start. This page provides full coverage of the video.
Teacher Resources
Curriculum Corner, Refraction and Lenses
Our Curriculum Corner section of the website includes a large collection of Think Sheets that make great complements to the video. Each Think Sheet focuses on a single concept and is structured to incrementally guide a student through the concept. They make for great follow-ups to the video, good cooperative group activities, and inclusions in any lesson plan. And if you need source documents (Microsoft Words), extended licensing rights, and solutions, consider the purchase of our low-cost Solutions Guide download
Physics Interactives, Refraction and Lenses Section, Refraction
Our refraction simulation provides a great environment for students to explore what happens when light reaches the boundary between two materials. Combine the simulation with the use of one of our student activity sheets and the accompanying Concept Checker and you will have the start of a great lesson plan.
Physics Interactives, Refraction and Lenses Section, Least Time Principle
Our Least Time Principle simulation centers around the classic questiion of what path does the light guard take to reach the drowning swimmer in the least amount of time? Students use a trial and error method to determine the optimal entry point - the point that takes the least amount of time. Once found, the angle of approach and departure from the boundary and reported. Students then relate the angles to the running and the walking speed of the life guard. This is a great inquiry-driven activity.
Minds On Physics, Refraction and Lenses Module, Mission RL1
Student persistence with Minds On Physics combined with reflective thinking and the use of our Help function will put any student at the top of the class. Mission RL1 on the topic of refraction is short and a great concept development tool for students.
The Physics Classroom Tutorial, Refraction and the Ray Model of Light, Lesson 1, Optical Density and Light Speed
Our written tutorial pages form the basis of most videos. So when a student needs a quick reference, the Tutorial page is a great place for them to start. This page provides full coverage of the video.
Lesson Notes
Download (opens in a new tab) or view below
Slides
Do you like the slides we used? They are available in our low cost Teacher Presentation Pack, along with other updated materials used in our presentation.