Pls help with this question i only have 25 mins. I dont need the explanation, just the answer

thank you

QUESTION 18 Laser light of wavelength 619 nanometers is sent through a circular aperture. By examining the pattern on the wall, which is 4 0 meters away from the aperture, it is found that the diameter of the central circular area is 1.6 centimeters. Find the diameter of the aperture. Report your answer in micrometers, rounded to zero decimal places