d=−+=−°+°°==×−λλθλ2121222224680430204302020914914 10cossinsincossin.∆∆∆bgbgbgbgbgnmnmmm.There are 1/d= 1/(9.14 ×10–4mm) = 1.09 × 103rulings per mm. 53. The angular positions of the first-order diffraction lines are given by dsin = λ. Let λ1be the shorter wavelength (430 nm) and be the angular position of the line associated with it. Let λ2be the longer wavelength (680 nm), and let + ∆be the angular position of the line associated with it. Here
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