Angle of refraction calculator challenge
In this activity, students choose two types of transparent substance. They then enter the angle of the incident ray in the spreadsheet calculator, and the angle of the refracted ray is calculated for them.
By the end of this activity, students should be able to:
use a spreadsheet calculator to calculate the angle of refraction
define the terms ‘incident ray’, ‘refracted ray’ and ‘normal’
recall the refractive index values for water and air
describe how the amount of refraction (bending) depends on the refractive index of the two substances light is passing between
describe the direction that light bends when it passes into a substance with a higher refractive index
describe the direction that light bends when it passes into a substance with a lower refractive index
find the maximum angle possible before all light is totally internally reflected when light travels from a more-dense substance (such as water) into a less-dense substance (such as air).
Refraction
By using the example of spearing a fish, Associate Professor Gordon Sanderson, an ophthalmologist from Otago University, explains the principle of refraction. Refraction is as a consequence of light travelling at different speeds through different media. The bending of light coming to your eye from the fish at the water/air interface makes it appear to be further back than it actually is.
Download the Excel file (see link below) for the Angle of refraction calculator.
Download the Word file (see link below) for:
introduction/background notes
what you need
what to do
student record sheet.
Nature of science
Scientists often use models and spreadsheets to help with calculations that predict things such as how much light will bend as it passes from one substance into another.
Related content
For more information about refraction of light, see Refraction of light.
Activity ideas
Investigating refraction and spearfishing – students aim spears at a model of a fish in a container of water. When they move their spears towards the fish, they miss!
What is refraction? – students are introduced to an analogy through a role-play that helps them visualise the refraction of light.
Useful link
This simulation provides opportunity for further, more in-depth investigations of how light behaves as it passes from one substance into another.
