Can a bulb be used as convex lens?

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Offline thinhnghiem

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Can a bulb be used as convex lens?
« on: 15/06/2016 13:12:07 »
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

newbielink: [nonactive]
« Last Edit: 15/06/2016 17:31:24 by chris »


Offline Colin2B

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Re: Bulb used as convex lens
« Reply #1 on: 15/06/2016 14:24:16 »
Do you have a science question?
If not we will move this to science experiments
and the misguided shall lead the gullible,
the feebleminded have inherited the earth.