$^1$notes
$^{2(n)}$Nelson Physics 4|5 2nd edition, page number n
$^3$https://phys.libretexts.org/Bookshelves/College_Physics/Book:_College_Physics_1e_(OpenStax)/16:_Oscillatory_Motion_and_Waves/16.09:_Waves
$^4$https://phys.libretexts.org/Bookshelves/Optics/Supplemental_Modules_(Components)/Mirrors
$^5$https://phys.libretexts.org/Bookshelves/University_Physics/Book:_University_Physics_(OpenStax)/University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/01:_The_Nature_of_Light/1.03:_The_Law_of_Reflection
$^6$https://phys.libretexts.org/Bookshelves/College_Physics/Book:_College_Physics_1e_(OpenStax)/25:_Geometric_Optics/25.03:_The_Law_of_Refraction