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Old Jun 15th 2016, 05:54 AM   #1
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Bulb used as convex lens

Dear all
I have used a bulb which is filled in with water, it works like a convex lens to concentrate solar energy.
The performance of the water bulb gets highest level when I incline the bulb like in the clip. Solar light beam focus on a bigger dot, in compared with the dot when let the bulb standing vertically.

See my clip at

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Old Jun 20th 2016, 01:08 PM   #2
MBW
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I note that your bulb is more pear shape than spherical,
This is the reason that it focuses differently at different angles.
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