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Plane Transmission Diffraction Grating

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1. What is grating?

  • A reflective surface used in telescopes
  • A transparent sheet with no pattern
  • A single slit used to pass light
  • An arrangement of many close, parallel, equidistant slits separated by opaque regions

2. What is grating element?

  • The spacing (a+b) between adjacent slits in a diffraction grating
  • The number of slits per millimeter
  • The width of the transparent slit only
  • The distance between two opaque regions

3. What is diffraction?

  • Reflection of light from a surface
  • Bending of light at an obstacle or aperture of size comparable to the light's wavelength
  • Change in frequency of light in a medium
  • Splitting of white light into colors

4. What are the two types of diffraction of light?

  • Fresnel diffraction and Fraunhofer diffraction
  • Constructive and destructive diffraction
  • Longitudinal and transverse diffraction
  • Visible and invisible diffraction

5. What is the resolving power of an instrument?

  • Its ability to separate images of two close point objects
  • Its ability to magnify objects
  • The maximum angle it can detect
  • Its ability to produce only one spectrum

6. What is the name of the eyepiece used?

  • Huygens eyepiece
  • Compound eyepiece
  • Ramsden’s eyepiece
  • Galilean eyepiece

7. Why can't the third-order spectrum be seen through the telescope?

  • Because the maximum value of sin θ is 1, making the highest visible order less than 3
  • Because third-order light is absorbed by the grating
  • Because the telescope cannot resolve colors
  • Because the grating blocks higher-order spectra

8. What is the main difference between the spectrum obtained by grating and that due to prism?

  • Both grating and prism give identical spectra
  • Grating only allows blue and green to pass
  • Prism diffracts all colors equally
  • Grating diffracts red most and violet least, reversing the color sequence compared to a prism

9. Which gives more intense spectrum—a prism or grating and why?

  • Grating, because it produces multiple spectra
  • Grating, because it reflects light back into the source
  • Prism, because it concentrates all light into one spectrum
  • Prism, because it absorbs less light than grating