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Homework Statement:

Hey,
due to the corona—virus here in Germany all schools are closed down. Today our teacher gave us two tasks but I'm not sure which formulars I should use.
1.Calculate the Angel below the 3rd.diffraction minimum behind a single slith that's 0.3 mm width. The laserpointer is a red one with a wave length of 630nm.
2.A parallel red light falls through a double slit. Interference appears on a screen that's 3meters away from the lightsource.The distance between the 1st and zero maximum is 4mm. The column spacing d=0,5mm.
Calculate the Wave length of the red light
Thanks in advance
Relevant Equations:
 I have added a picture with my attempts to find a solution and equations..

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