A laser beam is incident on two slits with a separation of 0.215 mm, and a screen is placed 5.45 m from the slits. an interference pattern appears on the screen. if the angle from the center fringe to the first bright fringe to the side is 0.183°, what is the wavelength of the laser light?

Question

Casey Palmer

Physics

2 May, 06:15

A laser beam is incident on two slits with a separation of 0.215 mm, and a screen is placed 5.45 m from the slits. an interference pattern appears on the screen. if the angle from the center fringe to the first bright fringe to the side is 0.183°, what is the wavelength of the laser light?

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Aurora Harrell · Answer 1

Use: dsin (θ) = mλ where d is slit separation, m is fringe order (1 here), and

θ = 0.183

Now λ = dsin (θ) / m = (0.215e-3) (sin (0.183)) / 1 = 6.867e-7 or λ = 687.7nm

(red laser)