Viva Questions On Diffraction Grating Pdf !!LINK!! Download
Viva Questions On Diffraction Grating Pdf !!LINK!! Download
Viva Questions On Diffraction Grating Pdf Download
3. describe the diffraction grating.
a) a device for dividing light into its component colors. b) a device to diffract light.
c) an optical element to be used in a microscope to divide light into its component colors. d) a device for splitting light into its component colors. e) an optical element to be used in a microscope to split light into its component colors.
4. explain what is the difference between a diffraction grating and a prism?
a) a prism is used to direct light from a source toward a detector
b) a diffraction grating is used to deflect light from a source toward a detector
6. explain the diffraction grating and the grating equation?
a) the diffraction grating is used to split the light of a single wavelength into its component colors. b) the grating equation describes how the diffraction grating operates. c) the grating equation does not contain the wavelength of light and is not applicable for the monochromatic light. d) the grating equation describes how the diffraction grating operates. e) the grating equation describes how the diffraction grating operates. f) the grating equation does not contain the wavelength of light and is not applicable for the monochromatic light.
9. what is the highest order spectrum which may be seen with a monochromatic light of wavelength 5000 by means of a diffraction grating with 5000 lines/cm
a) 1
b) 2
c) 3
d) 4
answer: d
clarification: here, n = 5000. therefore, a + b = 1/5000 cm
now, as we know, nmax = a + b/
= 1/5000 x 5000 x 10-8
= 4.
16. a blazed grating has atleast what features?a) lune-like groovesb) w-shaped groovesc) rectangular groovesd) u-shaped groovesanswer: cclarification: a blazed grating is a grating where the grooves are at right angles to the grating lines. so the grooves in a blazed grating are rectangular.
17. what is the dispersive power of a blazed grating?a) 0b) 1c) 2d) 3answer: cclarification: the dispersive power of a blazed grating is given by:(frac{partial theta}{partial lambda}) = n/(a + b) cosnow, here n = 3 and a + b = 1/5000 cmhere, sin = n/(a + b) = 0.6cos = 0.8now, (frac{partial theta}{partial lambda}) = 3 x 4000/0.8= 15000.
18. what is the diffraction efficiency of a blazed grating?a) 0b) 100%c) 50%d) 25%answer: cclarification: the diffraction efficiency of a blazed grating is given by:(frac{diffraction efficiency}{diffraction efficiency of incident light}) = 1 – sinnow, sin = n/(a + b)here, n = 3 and a + b = 1/5000 cmhere, sin = 0.6now, (frac{diffraction efficiency}{diffraction efficiency of incident light}) = 1 – 0.6 = 0.4i.e. the diffraction efficiency of a blazed grating is 50%.
14. a typical experiment is carried out at _____________a) 561 nmb) 633 nmc) 700 nmd) 790 nmanswer: bclarification: we know; the dispersive power of a grating is given by:(frac{partial theta}{partial lambda}) = n/(a + b) cosnow, here n = 3 and a + b = 1/5000 cmhere, sin = n/(a + b) = 0.6cos = 0.8now, (frac{partial theta}{partial lambda}) = 3 x 4000/0.8= 15000.
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