Resource Type
Lesson
Region
Antarctic
Completion Time
About 1 period
Grade
Middle School and Up
Permission
Download, Share, and Remix
Related Members
Materials
Polarized filter paper (on-line, various sites $0.75/sheet up to $13.00/ sheet based on size, sometimes physics dept. will have this for optics demonstrations)
Glass petri dishes or paper cups (Dixie cups work well)
Access to a freezer
White light flashlights or a light box such as a gel electrophoresis white light box or an overhead projector can also work
Students may want to have access to a device on which they can take pictures.
Pictures of Thin Sections
Lesson Materials (Rubric Assessment)
Topic
Snow and Ice Science
Polar Science
General Polar Science

Overview

Ice is a medium that nearly everyone is familiar with. We put it in drinks, skate on it for hockey and scrape it off our windshields in winter. Ice can be turned into sculptures and can even make for some fantastic winter scenery. Ice can also turn into a kaleidoscope of color and patterns under the right circumstances. Science and art collide in the wonder that is ice.

Objectives

The objectives of this lesson are to encourage students to wonder, to see beauty where perhaps they didn’t think any existed and to create a desire to experiment. Students will discover how polarized light can create patterns in thin-section ice.

Lesson Preparation

  • Collect materials for experiment and download Lesson Materials.
  • Each student/group will need two sheets of polarized filter paper simultaneously.
  • Download thin ice sections photos for display for students.
  • If you live in an area that has cold winters, it might be a great activity to do outside as it will limit melting of the ice.

Procedure

Day 1: 10 minutes

  • Distribute a glass petri dish or paper cup to each student. Have them write their name on their dish/cup.
  • Divide them into groups of 4 or 5 students (lab groups work well).
  • Each student within the group should fill their dish/cup with differing amounts/depths of water. Full dishes/cups of water will not work well. 1cm, 2cm, 3cm, 4cm…depths are ideal. If freezer space is limited, you could have each group do a single cup with each group having a differing amount of water.
  • Place the dishes/cups in the freezer overnight.

Day 2: 45 minutes

  • Distribute the polarized filter paper (2 sheets) to each group. Have them experiment with turning the sheets, one on top of the other, to understand how the filters work. Have them experiment when the sheets are at 90˚ angles with respect to one another and various angles in between.
  • Have each group/individual grab their dish/cup from the freezer and if using paper cups, QUICKLY peel the paper away from the thin frozen ice.
  • Immediately have them sandwich the ice or dish of ice between two sheets of polarized paper at 90˚ angles and place t it on the light box. Have them take a picture with their device.
  • You may need to have students do this in waves as melting will occur in warm classrooms.
  • After all students have their pictures, have them compare from 1cm depths to thicker ice to see what differences they are able to see.
  • Pull up the images of thin section ice as shown below and show the students what possibilities there are.
  • Brainstorm ways students might be able to achieve imagery such as what is in the photos.
  • Have students sketch/draw or design a “stained” glass window based on the photos of their own thin ice sections or of the ones in the pictures. This could be done with colored tissue paper or colored pencils on paper or other creative ideas.

Extension

  • Have students design an experiment to achieve better coloration within their own ice sections. Have them run the experiment to test their results.
  • Have students research polarized light and birefringence.

Resources

Assessment

  • “Stained” glass window/picture of their thin section.
  • Modifiable rubric included in Lesson Materials.

Author/Credits

Jennifer Bault, 2017, PolarTREC Teacher
jenniferbault [at] nicolet.us

Dr. Pat Langhorne
Otago University, New Zealand
pat.langhorne [at] otago.ac.nz

Thin section in a few vibrant colors
Vibrant colors emerge under polarization

Thin section ice thickness
How thin is a thin section?

A rainbow of color in ice
A rainbow of color captured in ice

Less thin ice section showing less color
A thin section that is not quite so thin, but still showing some color

Thin section from an ice core, mostly black and white
Thin section without much color, but showing ice structure.

Thin section full of color and wonder
Thin section full of color and wonder

Standards Other

Wisconsin Standards for Environmental Literacy & Sustainability
ELS.C1.C.h Investigate and analyze one’s own curiosities about patterns that emerge from outdoor exploration to develop new questions, draw conclusions, or formulate new ideas or solutions. Reflect and share how one’s perspectives influence personal curiosity, the pursuit of knowledge, and respect for others and the environment.