(b) A diffraction grating has 7,000 lines per centimeter. When the grating is illuminated normally with a monochromatic

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B A Diffraction Grating Has 7 000 Lines Per Centimeter When The Grating Is Illuminated Normally With A Monochromatic 1 (76.98 KiB) Viewed 38 times

(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 i. wavelength of the light ii. third order maximum (3 marks) (c) Red laser light from a He-Ne laser (λ = 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 à creates a first-order fringe at 20.6 °, Find 2. (2.5 marks)