Advertisement Remove all ads

What is Antireflection Coating? What Should Be the Refractive Index and Minimum Thickness of the Coating? - Applied Physics 2

Answer in Brief

What is antireflection coating? What should be the refractive index and minimum thickness of the coating?

Advertisement Remove all ads

Solution

When the light enters the optical instrument at the glass air interface, around 4% of light that too at single reflection is lost by reflection which is highly undesirable. In order to reduce the reflection loss, a transparent film of proper thickness is deposited on the surface. This film is known as antireflective coating.
Popular material used is MgF2 because of its refractive index is 1.38.
The minimum thickness of coating is given by: -
2nt = mλ
n = refractive index of film
t = thickness of film
m = 1, 2, 3, …
λ = light wavelength in vacuum (air)

Concept: Interference in Thin Film of Constant Thickness Due to Reflected and Transmitted Light
  Is there an error in this question or solution?
Advertisement Remove all ads
Advertisement Remove all ads
Advertisement Remove all ads
Share
Notifications

View all notifications


      Forgot password?
View in app×