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AB - A favorite qualitative optics demonstration I perform in introductory physics classes makes use of students' eyeglasses to introduce converging and diverging lenses.1 Taking on the persona of a magician, I walk to the back of the classroom and approach a student wearing glasses. The top part of Fig. 1 shows a glasses-wearing student who is farsighted in her left eye and has a slight astigmatism in her right eye.

On the evolution of eyeglasses and spectacles - …

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N2 - A favorite qualitative optics demonstration I perform in introductory physics classes makes use of students' eyeglasses to introduce converging and diverging lenses.1 Taking on the persona of a magician, I walk to the back of the classroom and approach a student wearing glasses. The top part of Fig. 1 shows a glasses-wearing student who is farsighted in her left eye and has a slight astigmatism in her right eye.

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A ray of light passing from the air into glass, showing the incident ray (in the air) and the refracted ray (in the glass).
A refractive index of 1.5 will slow down light and bend it toward the normal inside the glass block.

Light Geometric Optics « KaiserScience

Seeing red: JHU's Applied Physics Lab will build 'eyeglasses' for Mars moon mission 2024 launch planned for Japan Aerospace Exploration Agency mission

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The Physics Classroom » Physics Tutorial » Refraction and the Ray Model of Light » Refraction by Lenses

This tutorial introduces optics and lenses in physics