Equations

Question 1

What is the wave equation?

Answer 1

Wave speed = frequency x wavelength
V = f λ

Question 2

What is the equation linking frequency and time period?

Answer 2

Frequency = 1/time period
f = 1/T

Question 3

What is the equation for phase difference?

Answer 3

Phase difference = (distance/wavelength) x 360’
Pd = (x/λ)360’

Question 4

What is the equation to convert from angle in radians to angle in degrees?

Answer 4

Angle in r = (angle in degrees/360) x 2π

Question 5

What is the equation for refractive index?

Answer 5

Refractive index = speed of light in vacuum/velocity of light in the medium
n = c/v

Question 6

Write Snell’s law equation.

Answer 6

Refractive index of material 1 x sin(incident angle) = refractive index of material 2 x sin(refracted angle)
n1Sinθ1 = n2Sinθ2

Question 7

What is the equation for the critical angle in total internal reflection?

Answer 7

Sin(critical angle) = 1/refractive index of medium
Sin(θ) = 1/n1