Staying in Focus
an Online Optics Tutorial on the Eye
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Video 1: Measuring the focal length in the sunlight
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If you want to use a lens to start a fire in the wilderness, you need:
a.
A convex lens, because it bundles the light.
b.
A concave lens, because is bundles the light.
c.
Any type of lens will work, because it gets warm behind the glass.
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