12) Calculate the maximum reflected wavelength by a thin film of refractive index 1.4 and thickness 95 nm.
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- In a thin film, light waves are reflected from the background and the film is capable of interfering with each other.
- When interference takes place the final intensity might increase or decrease. Constructive interference is when the intensity is increased. Destructive interference takes place when intensity reduces.
- Condition for constructive interference for a film of given refractive index and thickness is given by,
Here n is the refractive index of the film, d is the thickness, m is the order, and λ is the wavelength of the source.
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- 12. A different diffraction grating apparatus has a line density of 18,000 lines per centimetre. You have an adjustable laser. What wavelengths would produce 5 bright lines on a screen, if non-visible EM radiation is possible?3. A single slit in an opaque screen is illuminated with a He-Ne laser (A = 1.1522 µm), and on a distant screen it is found that the middle of the tenth dark fringe in the interference pattern lies at an angle 0 = 6.4° from the central maximum. What band of the EM spectrum does this wavelength of light belong to? (a) (b) What is the width of the slit? (b) (c) tween the slit and the distant screen is immersed in water (n = 1.33) rather than At what angle (in degrees) will this minimum appear if the region be- air? (c)38. Measurements are made of the intensity distribution within the central bright fringe in a Young's interference pattern (see Fig. 36.5). At a particular value of y, it is found that I/ - 0.810 when 600-nm light is used. What wavelength of light should be used to reduce the relative intensity at the same location to 64.0% of the maximum intensity?
- 1a) The third-order dark fringe of light with a wavelength of 652 nm light is observed when the light passes through two narrow slits onto a screen. The slit distance is 6.3 x 10^-6 m. At what angle is the fringe observed? b) In an interference experiment, red light (600 nm) passes through a double slit. On a screen 1.5 m away, this distance between the 1st and 11th dark bands is 13.2 cm. What would the spacing be, between adjacent nodal lines, if blue light (450 nm) were used?2. If the light is replaced by another light with two wavelengths 700nm and 800nm. Is there any chance of overlapping of bright fringe by wavelength1 with bright fringe of wavelength of 2.11. Light of wavelength 520 nm is incident perpendicularly on a diffraction grating having 200 lines/mm. What is the highest order for which a sharp maximum occurs? (1) 9 (2) 11 (3) 7 (4) 8 2x1²x2 /1.5 WA (5) 5 2₁
- 8. A 26m wavelength of a radio wave is produced by two sources simultaneously. The interference of these two waves are observed at a point on a line perpendicular to the source. The sources are at a distance 78 and 143m away from the point of observation. Describe the nature of interference at the point and also find the order of the max/min reception at that point.#21. In a single-slit experiment, light passes through the slit and forms a diffraction pattern on a screen 2.54 [m] away. If the wavelength of light is 655 [nm], and the width of the slit is 4.41 x 10-5 [m], find the linear distance on the screen from the center of the diffraction pattern to the first dark fringe. Upload Choose a File1.) The distance between two slits in a double-slit experiment is 0.0016 mm. What is the angle between the central maximum and the second dark fringe in the interference pattern produced with light having a wavelength of 520 nm?