8) Light is incident normally on a grating with 10,000 lines/cm.Find the maximum order in which 650-nm light will be visible.
8) Light is incident normally on a grating with 10,000 lines/cm.Find the maximum order in which 650-nm light will be visible.
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Transcribed Image Text:8) Light is incident normally on a grating with 10,000 lines/cm.Find the maximum order in which 650-nm
light will be visible.
Expert Solution
Concept and Principle:
- A diffraction grating is used to separate the colors in incident light. It works on the principle of diffraction where light bend around small obstacles.
- A diffraction grating diffracts the light into several beams in different directions and the angle of diffraction will depend on the wavelength of the light, spacing between the grating, and the incident angle. These beams will then interfere to form the spectrum.
- The condition for maximum intensity is the same as double slit and is given by,
Here d is the space between the gratings, θ is the angular spacing, m is the order of the fringe, and λ is the wavelength of the source.
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