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प्रश्न
What is diffraction grating? What is the advantage of increasing the number of lines in the grating?
उत्तर
1.A diffraction grating is an arrangement consisting of a large number of parallel slits of same width and separated by equal opaque spaces.
2.It is obtained by ruling equidistant parallel lines on a glass plate with the help of a diamond.
3.The lines act as opaque spaces and the incident light cannot pass through them.The space between the two lines is transparent to light and acts as a slit.
4.The spacing between the lines is of the order of wavelength of visible light.The number of a lines in a plane transmission grating is of the order of 15000 to 20000 per inch.
Advantage of increasing the number of lines in the grating are :
(a)The number of principal maxima that can be seen on a screen increases.
(b)The distance between two adjacent principal maxima increases.
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संबंधित प्रश्न
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Explain the experimental method to determine the wavelength of spectral line using diffraction grating.
What is the highest order spectrum which can be seen with monochromatic light of wavelength 6000 Ao by means of a diffraction grating with 5000 lines/cm?
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In plane transmission grating the angle of diffraction for second order principal maxima for wavelength 5 x 10-5 is 35o. Calculate number of lines/cm for this diffraction grating.
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Derive the condition for absent spectra in grating.
