Basics

The experiments and activities on this site will prompt many questions and further exploration.

Fermat's Principle

Rays are traced through an optical system using Fermat’s Principle, which says that the rays of EM Rad follow only the fastest route when...

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Lenses and Mirrors

A lens is a transparent device with two curved surfaces, usually made of glass or plastic, that uses refraction to form an image of an object.

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Geometrical Optics

Geometrical optics, or ray optics, is frequently used to study how images form in optical systems.

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Power of Ten

People find it cumbersome to speak of units of measurement like "one ten thousandth of a billionth" of an inch, or even "ten to the...

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Optics is both science and engineering

Optics involves both science and engineering. Optics is a field of such variety that scientists and engineers with all kinds of interests...

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Optics is rays, waves, and photons

Science and engineering have always relied on models to explain and predict the behavior of the physical world, and optics is no exception. Three...

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Pi Day

Learn about Pi and help us celebrate the never ending number.

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