Textbook ExpertVerified Tutor
25 Dec 2021
Given information
Wavelength of light having bright fringe
Refractive index of coating
Refractive index of lens material = 1.52.
Step-by-step explanation
Step 1.
The refractive index of glass material is 1.52 , which is more than refractive index of coating which is applied on it .
Hence , Hence two reflected rays involved in the interference come from material having greater refractive index . So,
the condition for constructive interference is given as follows .
Path difference
Here d is thickness of coating , n is an integer.
For minimum thickness ,
Unlock all Textbook Solutions
Already have an account? Log in