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18. For the following objective lens, if the refractive index η is 1.51 and the half angle of the angular aperture μ is20: wh

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0.51645 Ximuw abele 녀00 x0-51645 327.259 nm LA나 AL of 387-259 γη vnofhouteu&use.soeA.

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18. For the following objective lens, if the refractive index η is 1.51 and the half angle of the angular aperture μ is20: what is the numerical aperture of this objective lens? If the light with 400...
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