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bihanna1234
19.02.2020 •
Physics
Consider two gratings. One grating has 3000 lines per cm, and the other one has 6000 lines per cm. Both gratings are illuminated with a beam of the same monochromatic light. Which grating produces the greater separation of colors?
a. The grating with 3000 lines produces the greater dispersion.
b. The grating with 6000 lines produces the greater dispersion.
c. Both gratings produce the same dispersion.
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Ответ:
Option B, The grating with 6000 lines produces the greater dispersion
Explanation:
The diffraction ability of the grating is equal to the angular dispersion which depends on the dispersion angle.
As per the equation
where
As per the equation, angular dispersion is inversely proportional to the number of lines (grit line spacing). Thus, the spacing should be minimum to produce greater angular dispersion.
Hence, option B is correct
Ответ: