written by Rebecca Vieyra
sub author: Caroline Hall

This lesson blends physics, geometric optics, and biology as students explore light refraction through convex and concave "lenses" made of clear gelatin. The activity promotes understanding of four key concepts: 1) convex lenses cause light to converge, while concave cause divergence; 2) Focal length can be determined from the convergence point of a convex lens; 3) Ray diagrams provide a geometric way to depict the path of light through a transparent object; and 4) The malleable gelatin lenses can model the function of the human eye.

This AAPT Lesson Plan was inspired by two articles in The Physics Teacher magazine: "Edible Optics: Using Gelatin to Demonstrate Properties of Light" by Patrick Bunton, and "Construction of Optical Elements with Gelatin" by Mario Branca and Isabella Soletta.

• Download FINALTeacherGuide-GelatinLens_RVieyra-2017January.pdf - 909kb Adobe PDF Document

Released under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 license.

Published January 8, 2017
Last Modified January 11, 2017

This file has previous versions.

by R. Vieyra and C. Hall

Word Version: Print and Customize Your Lesson

• Download FINALTeacherGuide-GelatinLens_RVieyra-2017January.docx - 4871kb Word Document

Released under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 license.

Published January 7, 2017
Last Modified January 11, 2017

This file has previous versions.

by Rebecca Vieyra

Printable Student Guide for classroom distribution.

• Download FINALStudentGuide-GelatinLens_RVieyra2017January.docx - 4228kb Word Document

Released under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 license.

Published January 7, 2017
Last Modified January 11, 2017

This file has previous versions.