Question: A long narrow slit 0.20 mm wide is illuminated normally with collimated blue hydrogen light ( = 486.1 nm). Immediately behind the slit is a

A long narrow slit 0.20 mm wide is illuminated normally with collimated blue hydrogen light (λ = 486.1 nm). Immediately behind the slit is a large positive lens of focal length 60.0 cm. It produces a diffraction pattern on a screen in its focal plane. How far apart are the first and second zeros of irradiance?

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