Question text
28 A pattern of interference fringes is produced using a red laser, a double slit and a screen. The screen is 3.5 m from the double slit. The light from the laser has a wavelength of 640 nm. The pattern of fringes is shown. bright not to fringe scale 72 mm What is the separation of the slits? A 1.2 (cid:117) 10–4 m B 1.6 (cid:117) 10–4 m C 3.1 (cid:117) 10–5 m D 3.3 (cid:117) 10–9 m
28 A pattern of interference fringes is produced using a red laser, a double slit and a screen. The
screen is 3.5 m from the double slit. The light from the laser has a wavelength of 640 nm.
The pattern of fringes is shown.
bright
not to
fringe
scale
72 mm
What is the separation of the slits?
A 1.2 (cid:117) 10–4 m B 1.6 (cid:117) 10–4 m C 3.1 (cid:117) 10–5 m D 3.3 (cid:117) 10–9 m
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