Respuesta :
Answer:
the thickness to meet the equation must be less than in a system for visible Liz t _UV < t_visible
Explanation:
When a ray enters the film antireflector that generally has a refractive index greater than the glass index, it experiences a phase change of 180, similar to when we have a collision with a wall.
When the beam reaches the bottom of the film-glass interface film, the refractive impact of the film is greater than that of the glass, it does not experience any change in phase.
Within the film the beam experiences a change in its propagation speed, the frequency in the air and the film is the same, since the propagation of a resonant type process, to fulfill the equation
v = λₙ f
The wavelength must change c = λ₀ f
c / v = λ₀ /λₙ
n = λ₀ /λₙ
λₙ = λ₀ / n
In general this type of reflection is almost normal to the surface, so we can calculate the optical path difference, if t is the thickness of the film, for constructive interference
2t = m λₙ + λₙ / 2
2t = (m + ½) λₙ
This is the condition to see a bright beam.], For destructive interference the equation is
2t = m λₙ
t = m λₙ / 2
Since the wavelength of visible light 400 to 700 is not much male than the wavelength of ultra violet light Lam <400 no, the thickness to meet the equation must be less than in a system for visible Liz
t _UV < t_visible
