How closely separated must a pair of Youngs slits be to see strong fringes from the Sun

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How closely separated must a pair of Young’s slits be to see strong fringes from the Sun (angular diameter ∼0.5◦) at visual wavelengths? Suppose that this condition is just satisfied, and the slits are 10 μm in width. Roughly how many fringes would you expect to see?

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