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Speed of sound in air
v = 331 m/s + 0.6 T
T = °C
Frequency of wave
v / λ
Frequency of light
c / λ
c = 3 × 108
Planck’s constant
6.626×10-34 Js
Wave equation
c = λv
Energy from wavelength
E = hc / λ
Mirror / lens maker equation
1 / f = 1 / i + 1 / o
Magnification
-i / o