LAST Question from Oxford Physics Entry Exam @zhelyo

Uploaded August 2024 | Updated September 2026, 2 weeks ago

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Here is a question from Oxford University's Physics Admissions Test, the PAT. This is the last question from 2017.
Please access the original paper here:
physics.ox.ac.uk/system/files/file_attachments/pat-2017.pdf
Important to note that there are no official solutions, I am not affiliated with the university and this is simply my approach to the problem and almost certainly there are other approaches and forms of the solutions.
Here is a great problem on refractive index and in a way, reverse critical angle and total internal reflection which was fantastic to solve. It involves dropping a ring along a boundary with two separate substances with different refractive index.
I hope this is useful and let me know if you come across alternative forms of the solution!

$LAST Question from Oxford Physics Entry Exam Join my PAT tutoring: https://zphysicslessons.net/physics-tutoring Join my free mailing list: https://zphysicslessons.net/about ( I e-mail problems and physics tips regularly) PAT Playlist: https://www.youtube.com/playlist?list=PLSygKZqfTjPDvik2yQTKYOLe7tCSGkOpB Here is a question from Oxford Universitys Physics Admissions Test, the PAT. This is the last question from 2017. Please access the original paper here: https://www.physics.ox.ac.uk/system/files/file_attachments/pat-2017.pdf Important to note that there are no official solutions, I am not affiliated with the university and this is simply my approach to the problem and almost certainly there are other approaches and forms of the solutions. Here is a great problem on refractive index and in a way, reverse critical angle and total internal reflection which was fantastic to solve. It involves dropping a ring along a boundary with two separate substances with different refractive index. I hope this is useful and let me know if you come across alternative forms of the solution!$

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$HALF A POINT from International Physics Olympiad in India My Physics Tutoring: https://zphysicslessons.net/physics-tutoring Physics Olympiads Playlist: https://www.youtube.com/playlist?list=PLSygKZqfTjPCKus_q7vWTaRClR2hi6XFe Here is a problem from the International Physics Olympiad in India from 2015. It derives Snells Law from the basics of refractive index and Fermats Principle of Least Time. The entire problem can be found here. Problem: https://ipho.olimpicos.net/pdf/IPhO_2015_Q2.pdf Official Solution: https://ipho.olimpicos.net/pdf/IPhO_2015_S2.pdf It can be used as practice for Physics Olympiads such as the British Physics Olympiad, International Physics Olympiad and similar difficult exams such as the JEE Advanced, Jee Main etc. It can be also be used as a challenge for A Level Physics.$