Snell's law of Refraction
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Uploaded by QuantumBoffin on Dec 14, 2009
An experimental demonstration of Snell's law of Refraction. Light is shone through a glass block at various angles. A calibrated paper template allows the angles of incidence and refraction to be determined. (The angle of incidence is also spoken out during the experiment).
- 62 likes, 4 dislikes
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Uploader Comments (QuantumBoffin)
Top Comments
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youtube is good for education^^
2 months ago 3
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@9999rox hes a man who evolved from a snail after discovering that light can penetrate tru his shell
All Comments (45)
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interesting video and very informative
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what are the names of the equipments used ??
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Who is snell
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@go2ec4 that is because the refractive index of ur medium is different from the one that is used in the vid.
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Foartee phiove degrees.
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@griffallstar I swear it's meant to be 42 degrees, but this one only started showing strongly at 70 ?
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Where did you get the sheet of paper with all the angles?
MegaMakeupify 4 months ago
@MegaMakeupify The sheet of paper was hand drawn, but it does the job. There are some commercial versions available (PASCo make one, I believe) but, alternatively, you could just photocopy (and enlarge) a protractor.
QuantumBoffin 4 months ago
How come total reflection does not occur until something very close to 90 deg?
In another video there seemed to be total reflection. Maybe it's because this is a white beam, that one was red?
HKNajjar 11 months ago
@HKNajjar this demonstration does not show total internal reflection - I plan to add another one that does at some stage. If you look at the ray you will see it always leaves the block travelling along the normal: total internal reflection occurs when this angle become large (about 43 degrees for glass, depending on the grade of glass).
QuantumBoffin 11 months ago
Hello,does the glass block have to be circular shaped for it to work??
junior1984able 1 year ago
@junior1984able It works with any transparent object (regardless of shape or material) - light even refracts when it leaves water, which is why it is difficult to judge how deep a swimming pool is.
QuantumBoffin 11 months ago