Light and waves Flashcards
Formulas involving light and waves
1
Q
What is the
Law of reflection of light
A
i = r
angle of incidence = angle of reflection
2
Q
What is the
Speed of light in a vacuum
A
299 792 458 m/s
c = 300 000 000 m/s = 3 × 10⁸ m/s
3
Q
What is the formula for
Refractive index
A
Refractive index = speed of light in a vacuum / speed of light in the material
n = (m/s) / (m/s)
4
Q
What is
Snell’s law
A
V₁ / sinθ₁ = V₂ / sinθ₂
V₁ = speed of light in first material
θ₁ = angle of incidence
V₂ = speed of light in second material
θ₂ = angle of refraction
5
Q
What is the formula for
The frequency of a wave
A
f = 1 / T
frequency = 1 / period
Hz = 1 / s
6
Q
What is the formula for
The period of a wave
A
T = 1 / f
period = 1 / frequency
s = 1 / Hz
7
Q
What is the formula for
The speed of a wave
A
v = fλ
speed = frequency × wavelength
m/s = Hz × m
