Answer:
Answer: The thickness of film is equal to 1/2 of wavelength in the film
Explanation:
Consider a thin film surrounded with two other transparent materials. Index of refraction of the top material is 1.2; index of refraction of a film 1.3 and of the bottom material 1.4 For normal incidence this film will look bright for light which wavelength satisfies the following condition a. Thickness of a film is equal to of wavelength of light in bottom material b. Thickness of a film is equal ½ of wavelength in the film c. Thickness of a film is equal ¼ of wavelength in the film. d. Thickness of a film is equal to ½ of wavelength of light in upper material e. Thickness of a film is equal ¼ of wavelength of light in upper material f. Thickness of a film is equal 4 of wavelength in bottom material
For constructive interference
Zt = ∧/n
t=∧/n
2
thickness = 1/2 x wavelength in the film
The thickness of film is equal to 1/2 of wavelength in the film
