(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Monochromatic light falls on two very narrow slits 0.046 mm apart. Successive fringes on a screen 5.30 m away are 7.0 cm apart near the center of the pattern. Determine the wavelength of the light to two significant figures.

2. Relevant equations

x2 ≈ Lθ2 = L (2λ) / d

3. The attempt at a solution

I'm guessing the θ is very small so I can assume sin θ ≈ θ in radians. When the problem said the successive fringes were 7.0 cm apart near the center of the pattern, I thought that meant x2 was 7.0 cm above x1.

λ = dx2 / 2L

λ = (0.07 m)(4.6 *10^-5 m) / (2 * 5.30 m)

λ = 3.01 * 10^-7 m

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# Homework Help: Wave Nature of Light - Calculating Wavelength (Double Slit Exp)

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