NCEA Level 3 Physics Practice Questions - New Zealand NCEA Level 3 Physics Examination Exam

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Light from a helium-neon laser with a wavelength of 632.8 nm passes through a double slit. Bright fringes are observed on a screen placed 2.50 m away. If the fringe separation on the screen is 4.50 mm, what is the separation between the two slits?

0.352 mm 0.703 mm 1.42 mm 2.85 mm

Correct Answer:

0.352 mm

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