2. (a) For a diffraction grating, explain the advantage of i. many slits, 11. closely spaced slits (b) A diffraction gra

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2 A For A Diffraction Grating Explain The Advantage Of I Many Slits 11 Closely Spaced Slits B A Diffraction Gra 1 (38.37 KiB) Viewed 41 times

2. (a) For a diffraction grating, explain the advantage of i. many slits, 11. closely spaced slits (b) A diffraction grating has 7,000 lines per centimeter. When the grating is illuminated normally with a monochromatic light, the second order spectral line is found at 62°. Find (5 marks) i. wavelength of the light ii. third order maximum (3 marks) (c) Red laser light from a He-Ne laser (= 632.8 nm) is used to calibrate a diffraction grating. If this light creates a second-order fringe at 53.20 after passing through the grating, and light of an unknown wavelength λ creates a first-order fringe at 20.6°, Find 2. (2.5 marks)