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Question: 

Light of wavelength $\lambda$ passes through a pair of slits separated by 0.17 mm, forming a double-slit interference pattern on a screen located a distance 37 cm away. Suppose that the image in Fig. 24–9a is an actual-size reproduction of this interference pattern. Use a ruler to measure a pertinent distance on this image; then utilize this measured value to determine $\lambda$ (nm).

(a) Interference fringes produced by a double-slit experiment and detected by photographic film placed on the viewing screen. The arrow marks the central fringe.

Figure 24-9 (a) Interference fringes produced by a double-slit experiment and detected by photographic film placed on the viewing screen. The arrow marks the central fringe.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$6.6 \times 10^{-7} \textrm{ m}$

Giancoli 7th Edition, Chapter 24, Problem 8

(3:00)

Chapter 24, Problem 8 is solved.

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