Answer:
0.1923 λ
Explanation:
t = thickness of the coating material applied over the lens
n = index of refraction of the coating material = 1.3
m = minimum order = 0
λ = wavelength of the incident light
For destructive interference , the condition is given as
2 n t = (m + (0.5)) λ
Inserting the values
2 (1.3) t = (0 + 0.5) λ
t = 0.1923 λ
