When blue light of wavelength 450 nm falls on a single slit, the first dark bands on either side of center are separated by 55.0 . : Determine the width of the slit

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In the figure, a broad beam of light of wavelength 660 nm is sent directly downward through the top plate of a pair of glass Link 2 5. The plates are 120 mm long, touch at the left end, and are separated by 69 um at the right end. The air between the plates acts as a thin film. How many bright fringes will be seen by an observer looking down through the top plate? Incident light Number Units

Light with wavelength i passes through a narrow slit of width w and is seen on a screen which is located at a distance D in front of the slit. The first minimum of the diffraction pattern is at distance d from the middle of the central maximum. Calculate the wavelength of light if D=3.1 m, d=1 mm and w = VAD. Give your answer in nanometers. Answer: nm Next page

E17P5

Light of wavelength 575 nm falls on a double slit, and the first bright fringe of the interference pattern is seen at an angle of 13.0° from the central maximum. Find the separation between the slits. μm

b. Coherent light of wavelength 590 nm passes through a thin single slit and a diffraction pattern is observed at a screen 1.5 m from the slits. The first dark fringe is observed at 2.00 mm from the center (i) What is the width of the slit? (ii) What is the location of the next symmetrical pair of dark fringes from the centre?

Light of wavelength 677 nm passes through a slit 6.30 × 10-6 m wide and falls on a screen that is 2.23 m away. What is the distance on the screen from the center of the central bright fringe to the third dark fringe on either side? Number Units

Using a 697 nm wavelength laser, you form the diffraction pattern of a 1.11 mm wide slit on a screen. You measure on the screen that the 11th dark fringe is 8.33 cm away from the center of the central maximum. How far is the screen located from the slit?