Question

A parallel beam of light of wavelength 450nm is incident normally on a diffraction grating which has 300lines/mm what is the total number of intensity maxima observed?

Answer 1

The total number of intensity maxima observed is determined as 15.

Number of intensity maxima observed

The number of intensity maxima observed is calculated as follows;

$n = \frac{1}{\lambda N}$

n = (1) / (450 x 10⁻⁹ x 300 x 10³)

n = 7.4

The total number of intensity maxima observed;

nt = 2n + 1

nt = 2(7) + 1

nt = 15

Thus, the total number of intensity maxima observed is determined as 15.

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