A monochromatic wave of light is normally incident on a diffraction grating with a period of d 2 μm
| May 6, 2021 | education
A monochromatic wave of light is normally incident on a diffraction grating with a period of d 2 μm, determine the wavelength if k = 4.
1. Let’s write down the formula of the diffraction grating and express the wavelength.
d * sin (a) = l * k.
l = d * sin (a) / k.
2. We substitute the initial data into the resulting equation, taking into account that it is necessary to convert micrometers to meters.
l = 2 * 10-6 m * sin (90) / 4 = 0.5 * 10-6 m.
Answer: 0.5 * 10-6 m.
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