Question

the formula for reflected light form thin film layer 2 m m 0,1,2..where t is the film thickness the wavelength of the light and n is the index of refraction, can be used to determine a) constructive interference only b) b) destructive interference c) c) both destructive and constructive interference. The following picture shows wave fronts of a wave propagating in the transparent materials A and B. What can you tell about the speeds V, Vs of the wave and indexes of refraction ne na in the materials A and B? a. VASV and nane b. VACve and nanec. Vcs and necne d. vyand nach 2 UAB 3. You punch a hole in a black paper with a needle and observe a diffraction pattern on the wall. If you take a thicker needle and enlarge the hole, the size of the central spot of the diffraction pattern will a. Increase b. Decrease 4. The name "iridescent color is used for the: a. Structural color which changes with the view angle b. Metallic color of pigment contain iridium C. Color of pigment used by painters in middle ages. 5. The diffraction effects become visible when the wavelength is comparable with the size of the object. Can diffraction occur if the size of the siltis slightly smaller than the wavelength? a. No b . Yes c. Only for longitudinal waves d. Only for transverse waves 6. What will you observe right behind a single hair when you shine a laser beam on it? a. Bright line b. Darkline c . Shadow and bright interference fringes on its sides 7. If we increase the number of slits in the diffraction grating a) The angle for the first dark fringe will increase. b) The angle for the first dark fringe will decrease. c) The bright fringes will become narrower d) Nothing will change as compared with two slits. 8. According to Babinet's principle the formulas for the interference of light from two slits separated by distance d and diffraction on a single gap with sized should be identical. a) True b) False 9. The light reflected from the transparent material with index of refraction larger than that from which it arrives changes phase. a) True b) False 10. Solar panels with antireflective coating have blue color. a) This is because they are designed to have destructive interference in the film coating for wavelengths shorter than then the wavelength of blue color b) This is because they are designed to have destructive interference in the film coating for wavelengths longer than then the wavelength of blue color 11. Is it acceptable to use small angle approximation for an angle of just 1 radian? a) Yes, (1 is a small number) b) No 12. If we do similar experiments with interference and diffraction for acoustic waves we should expect similar results. a) No, Young's experiment works only for light b) No, because electromagnetic waves are transverse and acoustics waves longitudinal c) Sure, waves are waves

Answer 1

are the corrat - Sete Following answers! 1. (a.) 2. (bo 3.) (b.) 4.) (a) 5:) (a) 6.) (a.) 7.) (a.) 8.) (a) 9.) (a.) 10.) (6) 11-) (b.) 12) (c)