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

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A double slit apparatus immersed in water (refractive index n = 1.33) is illuminated by green light (vacuum wavelength λ₀ = 532 nm). The slits are 0.150 mm apart and the screen is 1.20 m away. What is the fringe separation observed in water?

3.21 mm 4.26 mm 5.66 mm 2.41 mm

Correct Answer:

3.21 mm

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