1) A screen is placed a distance 2 m away from another screen with two slits 0.1

Question

1) A screen is placed a distance 2 m away from another screen with two slits 0.1 mm apart. Behind the slits is a coherent light source with wavelength, = 560 nm.    a) What is the distance between the central (zeroth) bright fringe and the first bright fringe from center? [4]

2. A screen is placed a distance 4 m away from another screen with a single slit of width 0.4 mm. Behind the slits is a coherent light source with wavelength, = 420 nm.   What is the distance between the first dark fringe and the third dark fringe? [5]

Explanation / Answer

1. y = lambda D / a

y = (560 x 10^-9) (2) / (0.1 x 10^-3)

y = 0.0112 m

2, y = 2 lambda D / a

y= (2 x 420 x 10^-9)(4) / (0.4 x 10^-3)

y = 8.4 x 10^-3 m

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