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Bent's Old Fort National Historic Site

Optical Illusions and Mirage on the Great Plains

• Type: Lesson Plan
• Grade Levels: Upper Elementary: Third Grade through Fifth Grade

Are your eyes playing tricks on you or is it the light? This lesson explores the properties of light and the environmental conditions which cause mirages. Students will examine some famous optical illusions before reading Josiah Gregg's experience with them when traveling across the Great Plains in the 1830s and 1840s.