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(b) Two objective lens, A and B (working in air). Diameters of the front elements are DA 1.6 mm and DB = 2 mm,

(b) Two objective lens, A and B (working in air). Diameters of the front elements are DA 1.6 mm and DB = 2 mm, respectively. And their working distances are WDA 0.6 mm and WDB = 0.5 mm, respectively. Calculate the NA values of these two lenses and indicate which lens has better optical resolution. (5 marks)

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