Refraction: GCSE revision

[@mevastronomy]

You sir have a gift, a gift of teaching and delivery of a complicated subject in a simplistic and understandable way that not only captivates and engages the layperson, but serves as a wonderful refresher for the science savvy individual. Kudos.

[@zaystarrrr]

Yes sir he does

[@jammydodger1217]

This Man is an absolute legend; I have my Physics GCSE exam tomorrow, and initially i was feeling very down since I had no clue about physics until i found him in a miracle and I seem to get everything in my specification, just in couple of hours, compared to a whole year in physics lessons! Amazing!

[@DrPhysicsA]

Thanks. I hope the exam goes really well.

[@OOO-wy5iw]

Total grade saver! Best wishes to you sir!

[@magn8195]

He is pretty good

[@bilalsyed5310]

why do I always find good videos one day before the exam?!

[@zaystarrrr]

Hahaha

[@googleuser4177]

i just paused the video to come here and tell you that you are amazing. thank you

[@ahamedakmal7104]

at 19:15 , can i say that critical angle is when reflected ray is 90 degrees

[@DrPhysicsA]

Well actually its the refracted ray which is at 90 degrees to the normal. The reflected ray will be at the critical angle on the other side of the normal.

[@deabo8799]

THANK YOU!!! I CAN SEE EVERYTHING SO CLEARLY! I ACTUALLY UNDERSTAND REFRACTION AND TIR :DD

[@UnGodlyliFe]

so are you saying at 17:24 if you were to change your position you could see the fish under water? Or if the fish changed their position they would be visible to the person on the surface?

[@DrPhysicsA]

+Vishal Yes.

[@pcheung4291]

2:50 So the children on the right have to accelerate beyond their travelling speed?

[@rommelron9626]

Gracias. Tnx. It's been a very informative and understandable video.

[@abiw5136]

What about Snell's rule: n¹ sin i = n² sin r ? How come you didn't use it here?

[@nauxnew13]

it's at 5:15 xD

[@johnblanning2500]

Excellent, but I think this includes details not currently required for GCSE Physics.

[@gamingdust3r]

i have a doubt on 27:45 u drew a normal but.... y didnt u draw it the opposite way like u drew it like this "/" (or something like this) y not like this "\" (a bit more slanting)?

[@DrPhysicsA]

+Gaming DUsT3R The normal to a surface is perpendicular to the surface. So since the surface is itself slanting the normal will be 90 degrees to it.

[@gamingdust3r]

+DrPhysicsA thnxs for answering

[@pegatrisedmice]

i can't believe it's so simple, i finally understand it now... tnx ;)

[@faadumofaadumo8913]

thanks

[@Ajay-xz9pp]

what is this?

[@nasreennaaz1227]

Just love your vids really helpful im going to appear in physics dis year can plz give me some advice on how to get better grades

[@DrPhysicsA]

No easy answers I'm afraid. Keep studying. Do the homework questions. Keep at it. All good wishes.

[@josephineletchumanan6969]

Is this course for the exam board aqa?

[@DrPhysicsA]

Josephine Letchumanan All my vids for GSCE and A level contain material suitable for all the main courses (AQA, OCR, Edexcel, CIE) but not all courses need all the material in the vids.

[@hlomphoprincess3573]

all i can say is wow...just wow

[@simbamekani]

I wish I knew this last year

[@martian4693]

thankyou sir:))

[@alharithu924]

Legend :)

[@hawwamuhusina9342]

When u dont know wheather it is suppse to be sin i/sin r or sin r/sin i. Just calculate both ways and the correct answer would be the answer >0.9.this way was correct in each question i did so far

[@aishathhassan1338]

👍