The ‘sluggish’ photon

What is sunlight? How is it created, and how much time does it take for it to arrive on Earth?

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Studying the focal point of a jar filled with water.

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Make a magnifying glass using a jar, some cling foil and a few drops of water.

The film projector

Find out how the images of a film appear on the screen.

The infrared eye

Is an everyday video camera able to detect frequencies invisible to the human eye?

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