Bulb used as convex lens

General Physics, Classical Mechanics, Newton, etc.

Bulb used as convex lens

Postby thinhnghiem » Wed Jun 15, 2016 4:13 am

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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Joined: Wed Jun 01, 2016 11:36 pm

Re: Bulb used as convex lens

Postby Q-reeus » Wed Jun 15, 2016 11:48 pm

So you have progressed from toy magnet rockers as perpetuum mobiles, aired with slight variations over four different threads in another forum site, to the thoroughly understood case of a spherical convex lens. Anything new in that YouTube demo worth discussing?
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