Verifying Snell's Law and Finding n
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do u know that ur video has been use for the insearch lab report assignment? hey anyone doing lit 201 comment it here man
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Great video. Ive been trying to find a decent explanation on how to find the R.I and finally i have! thank you!
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Hi, it's a full-circle protractor which I got ages ago from Philip Harris. (The i and r labels were photoshopped in!)
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Wow thank you so much! This really helped!
Sapphire101MFS 2 years ago
Great!
c4science 2 years ago
Ok, i c. Thank you. I've also done this experiment and when you move the ray box to the higher angels (like 70, 80) I notice there is "reflection" on the incidence side, so there are 3 beams of light. However, this "reflection" does NOT occurs in the lower angles. How is that explained?
adamninja13 3 years ago
When the angle in the air is ninety degrees, the angle in the perspex reaches a limit called the critical angle. For angles close to ninety, partial reflection occurs, as well as refraction, giving the three rays. If you reverse things, and imagine the light coming from the perspex, not the air, then for angles above the critical angle, no light will escape to the air, and total internal reflection will occur with i = r.
c4science 3 years ago
Ok that makes sense. I looked up some info on the critical angle. I understand total internal reflection and how it wud occur at 90, but im not too sure about the partial reflection...
Anyways, one more question, what sources of error or other kinds of discussion/analysis could i do for this experiment?
Thank you so much, you've been a great help.
adamninja13 3 years ago
Partial reflection occurs all the time. Sometimes it's so faint it can't be seen. So you get a combination of reflection and refraction at lower angles. However, once the angle in the air is ninety degrees, refraction is impossible and since only reflection occurs the term total internal reflection is used.
c4science 3 years ago
In terms of error, background light can make the exact angle hard to read so accuracy is improved by putting the apparatus into a large box or using a dark room. Avoid extremely small angles since that would increase the percentage error of the protractor. Graphing sin i against sin r and choosing the best straight line also increases accuracy. Cheers!
c4science 3 years ago