Answer:
Hence the order of the bright fringe is 7.
Explanation:
Diffraction can be defined as the deviation from rectilinear propagation and diffraction grating is used to measuring the wavelength of light using a spectrometer.
We have the formula d sin∅ = n l
We have to find the value of n in this equation and all other values are given.
Here d = 55000 lines
∅ = 12.23°
Wavelength , l = 550 nanometer
n is the order of the bright line.
Substitute these values in the given equation,
55000 sin(12.23°) = n
n = 7
Hence the order of the bright fringe is 7.