Question: A 3 5 card containing two pinholes, 0.08 mm in diameter and separated center to center by 0.10 mm, is illuminated by parallel rays

A 3 × 5 card containing two pinholes, 0.08 mm in diameter and separated center to center by 0.10 mm, is illuminated by parallel rays of blue light from an argon ion laser (λ₀ = 487.99 nm). If the fringes on an observing screen are to be 10 mm apart, how far away should the screen be?

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