43-2 Diffraction Gratings 4. Which of the following properties are true for both

Question

43-2 Diffraction Gratings 4. Which of the following properties are true for both a prism and a diffraction grating? (A) The device divides white light into spectral lines at dif ferent angular positions. (B) The device generates more than one image of a spec- tral line. (C) The device can make accurate absolute measurements of wavelength. (D) The device deflects violet light more than red light. 5. The Sun's spectrum consists of several dark absorption lines superimposed on a continuous spectrum. Which of the fol- lowing changes will help the dark bands to be more easily identified with a diffraction grating? (A) Increase the number of slits. (B) Increase the separation between slits. (C) Increase the width of the individual slits. (D) None of the above

Explanation / Answer

here,

4)

Diffraction gratings can provide a much higher resolution than prisms do, provided the grating has a lot of slits (20 or more).
Assuming you shine white light on it, then:

-A prism will do the dispersion and exhibit the rainbow spectrum. Colors wil be shown side-by-side and the spectrum will appear continuously.

-A DG will do the dispersion and exhibit a less complete rainbow spectrum. Colors will appear apart from each other, the spectrum will appear like marks of crayon well spaced between.

so the correct options are A

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