20 MCQs on Interference in Thin Films PDF

20 MCQs on Interference in Thin Films: 1. Which of the following phenomena is responsible for the colorful appearance of soap bubbles? ○ A. Diffraction ○ B. Refraction ○ C. Interference ○ D. Polarization 2. In thin film interference, the path difference between the reflected rays from th...

20 MCQs on Interference in Thin Films: 1. Which of the following phenomena is responsible for the colorful appearance of soap bubbles? ○ A. Diffraction ○ B. Refraction ○ C. Interference ○ D. Polarization 2. In thin film interference, the path difference between the reflected rays from the top and bottom surfaces of the film is: ○ A. 2t ○ B. 2t cos θ ○ C. 2t sin θ ○ D. t cos θ 3. The condition for constructive interference in a thin film is: ○ A. 2t = mλ ○ B. 2t = (m + 1/2)λ ○ C. 2t cos θ = mλ ○ D. 2t cos θ = (m + 1/2)λ 4. The condition for destructive interference in a thin film is: ○ A. 2t = mλ ○ B. 2t = (m + 1/2)λ ○ C. 2t cos θ = mλ ○ D. 2t cos θ = (m + 1/2)λ 5. A thin film of oil on water appears colorful due to: ○ A. Dispersion of light ○ B. Polarization of light ○ C. Interference of light ○ D. Diffraction of light 6. The phase change of π radians occurs upon reflection at an interface where: ○ A. The refractive index increases ○ B. The refractive index decreases ○ C. The refractive index remains constant ○ D. None of the above 7. The thickness of a thin film for maximum reflection of light of wavelength λ is: ○ A. λ/4 ○ B. λ/2 ○ C. λ ○ D. 2λ 8. The thickness of a thin film for minimum reflection of light of wavelength λ is: ○ A. λ/4 ○ B. λ/2 ○ C. λ ○ D. 2λ 9. The interference pattern in a thin film is: ○ A. Always bright fringes ○ B. Always dark fringes  ○ C. Alternating bright and dark fringes ○ D. None of the above 10. The color of a thin film depends on: ○ A. The thickness of the film ○ B. The angle of incidence of light ○ C. The refractive index of the film ○ D. All of the above 11. The interference pattern in a thin film is used in: ○ A. Anti-reflective coatings ○ B. Optical filters ○ C. Optical interferometers ○ D. All of the above 12. The interference pattern in a thin film is used to measure: ○ A. The thickness of the film ○ B. The refractive index of the film ○ C. The wavelength of light ○ D. All of the above 13. The interference pattern in a thin film is used to test the flatness of surfaces. ○ A. True ○ B. False 14. The interference pattern in a thin film is used to study the properties of materials. ○ A. True ○ B. False 15. The interference pattern in a thin film is used to create decorative coatings. ○ A. True ○ B. False 16. The interference pattern in a thin film is used to create optical illusions. ○ A. True ○ B. False 17. The interference pattern in a thin film is used to measure the thickness of a soap bubble. ○ A. True ○ B. False 18. The interference pattern in a thin film is used to measure the thickness of a human hair. ○ A. True ○ B. False 19. The interference pattern in a thin film is used to measure the thickness of a layer of oil on water. ○ A. True ○ B. False 20. The interference pattern in a thin film is used to measure the thickness of a layer of dust on a surface. ○ A. True ○ B. False