# Refraction and Snell’s Law – A Level Physics

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Published on January 28, 2015 by

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Lewis

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• Just want to say thankyou for putting your time and effort into these videos, I’ve just come across them and they’ve already made many things much clearer for me! So thankyou

• Hi there, do you have any videos explaining the critical angle? Thanks, good work on your videos by the way, there are many A level physics videos but I rarely come across any that aren’t boring so thanks 🙂

• Thank you

• I love your methods of explaining the concepts! They’re fab, as well as actually explaining them thoroughly! Thank you 😀

• You’re AMAZING! Thank you…for LIFE 🙂

• I find your videos very concise and well explained. Please keep up the good work !!!

• This is the most useful thing ever.

• +Alfan Alarabi Thanks!

• Thankyou so much.I have a phy exam on monday.Useful!!

• Thank you so much for the content! Would it be possible to make some videos on ray diagrams and lens, including the use of the equations?

• You are a brilliant teacher. That initial illustration of refraction is great. I hope you can lead me to victory on Monday.

• quality ray box? you mean they aren’t all just toilet roll rubes with a filament bulb taped to one end?

• 3:34 Isn’t snells law –> sin(i)/sin(r) = n(r)/n(i) and not = n?

• Bishop Baptu I think you’re right, but it’s typically used from air- something else, where the n of air is basically 1

• is there an explanation anywhere for why and how these things happen?

• why does it bend toward the normal

• I’m using your videos for GCSE revision. They actually go into enough detail for me to understand the whole concept, unlike most of the GCSE books and channels.

• Woah that analogy of refraction in the beginning! Genius!

• wait snell lived about 500 years ago how did he calculate speed of light