Refraction and critical angle IGCSE practice questions

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Practice questions with explanations from the extended syllabus for IGCSE. Questions would make a great start for A-level physics students. I spend a lot of time focusing on how to rearrange equations and interpret questions.
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Thanks! Although these hard questions help (I'm doing my mocks) I encourage to take 1sec to explain things like how to measure the angle of incident or common mistakes. Great video!

warmanMA
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I've got my paper 6 tomorrow...thanks a lot for the video! great help with past papers :)

NikitaVerma-the-one-and-only
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COOOL DUD E I WAS FINDING THSE SORT OF QUESTION FOR SO LONG 
THANX:D

nouftariq
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Why do you do 1 over? Is it just because you are doing the opposite?

Taqsunis