Question:
Monochromatic light falls on two very narrow slits 0.048 mm apart. Successive fringes on a screen 6.50 m away are 8.5 cm apart near the center of the pattern. Determine the wavelength and frequency of the light.
Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.
Quick Answer:
$6.3 \times 10^{-7} \textrm{ m, } 4.8 \times 10^{14} \textrm{ Hz}$
Giancoli 7th Edition, Chapter 24, Problem 3
(3:15)