About Lens Lab
Lens Lab is an optical bench in your pocket. In Bend the light you pick the lens that brings parallel rays or a bulb's light to a star, and learn that convex lenses bring rays together while concave lenses spread them out. Two puzzles are about lens power in dioptres (1 divided by the focal length in metres), the number on a glasses prescription.
In Find the picture you slide a screen, a candle or the lens itself until a sharp picture appears, and see that real images are upside down and can be bigger or smaller depending on where the candle stands. The rays are drawn, so you can see whether they have met yet. In Magnifier you move a bug inside the focal length to make a bigger, upright, virtual image.
Build it puts it all together: focus a camera on a far tree, focus a projector on a wall (and find out why slides go in upside down), and build telescopes from two lenses, where magnification is the objective's focal length divided by the eyepiece's. Six stars open the Free bench. Made by an eye doctor; and never look at the Sun through a lens, telescope or binoculars.
Best for ages 9+
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