Answer:
The wavelength of the light is 530 nm.
Step-by-step explanation:
Given that,
Distance D= 1.0 m
Distance between slits d= 0.30 mm
Number of fringe = 9
Width = 1.6 cm
We need to calculate the angle
Using formula of angle




We need to calculate the wavelength of the light
Using formula of wavelength


Put the value into the formula



Hence, The wavelength of the light is 530 nm.