Ch 32: Wave OpticsSee all chapters
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Young's Double Slit Experiment

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Concept #1: Young's Double Slit Experiment

Practice: A 450 nm laser shines light through a double slit of 0.2 mm separation. If a screen is placed 4 m behind the double slit, how wide are the bright fringes of the diffraction pattern?

Example #1: Unknown Wavelength of Laser through Double Slit

Additional Problems
You illuminate two very narrow slits in air by monochromatic coherent light and find that the first interference maximum on either side of the central bright spot is at an angle of ±12.0° from the center of the central bright spot. You then immerse the entire apparatus in a transparent liquid and find that the first maximum on either side of the central bright spot occurs instead at ±9.0°. What is the index of refraction of the liquid? (a) 0.5 (b) 1.3 (c) 1.5 (d) 2.0 (e) 3.0 (f) 4.0 (g) none of the above
A screen is illuminated by 512 nm light as shown in the figure below. The distance from the slits to the screen is 6.7 m. How far apart y are the central bright region and the third bright fringe? 1. 1.52482 cm 2. 2.27754 cm 3. 2.74312 cm 4. 1.07854 cm 5. 1.05012 cm 6. 3.2389 cm 7. 3.78953 cm 8. 0.66491 cm 9. 2.37883 cm 10. 7.46025 cm
Coherent light with wavelength λ = 600 nm falls on two very narrow closely spaced slits and the interference pattern is observed on a screen that is 4.00 m from the slits. Near the center of the screen the separation between adjacent maxima is 2.00 mm. The distance between the two slits is (a) 2.40 mm (b) 1.40 mm (c) 1.20 mm (d) 1.00 mm (e) 0.400 mm (f) none of the above answers
A double slit is illuminated with monochromatic light of wavelength 6.00 x 10 2 nm. The m = 0 and m = 1 bright fringes are separated by 3.0 cm on a screen which is located 10.0 m from the slits. What is the separation between the slits? (a) 4.0 x 10-5 m  (b) 8.0 x 10-5 m (c) 2.0 x 10-4 m (d) 2.4 x 10-4 m
A double slit is illuminated with monochromatic light of wavelength 6.00 x 102 nm. The m = 0 and m = 1 bright fringes are separated by 3.0 cm on a screen which is located 10.0 m from the slits. What is the separation between the slits? (a) 4.0 x 10-5 m  (b) 8.0 x 10-5 m (c) 2.0 x 10-4 m (d) 2.4 x 10-4 m
Two very narrow slits are illuminated by monochromatic coherent light in air that has wavelength 560 nm and the interference pattern is observed on a screen that is 4.00 m from the slits. The first interference minima are located at ∓58.0° on either side of the central bright band. You then immerse the slits and the space between the slits and the screen in a transparent liquid and illuminate the slits with the same light. Now the first minima on either side of the central bright band occur at ∓36.0°. What is the refractive index of the liquid?
When monochromatic light of wavelength (in air) of λ = 500 nm passes through two every narrow slits and the interference pattern is observed on a screen 2.0 m from the slits, the distance between adjacent maxima near the center of the screen is 3.0 mm. If the apparatus (slits and screen) is submerged in water, the distance between the adjacent maxima is A) 3.0 mm B) larger than 3.0 mm C) smaller than 3.0 mm
A screen is illuminated by monochromatic light as shown in the figure below. The distance from the slits to the screen is L. Using the small angle approximation ( θ = sin θ = tan θ), what is the wave length if the distance from the central bright region to the second bright fringe is y.