Monochromatic light of wavelength 550 no passes through a diffraction grating that has 55000 lines/m. a bright line appears on the screen at an angle of 12.23o from the central bright fringe. what is the order of this bright line?

a. 5
b. 6
c. 7
d. 8

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.

answer; ///(74) degrees is your answer..

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