Question

Blue light of wavelength 470 nm is used to illuminate a pair of narrow slits that...

Blue light of wavelength 470 nm is used to illuminate a pair of narrow slits that are
0.020 mm apart and 1.60 m from a screen.

What is the angular position of the second-order minimum (dark spot)?

What is the distance on the screen between the central maximum and the second-order minimum?

The reason there is a dark spot at this location on the screen is because light from one slit has to travel further than light from the other slit.  What is this extra distance in terms of wavelengths (or half wavelengths)?

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