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Water immersion objective
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<p>In <a href="/facts/Light_microscopy/GpHlElDS">light microscopy</a>, a water immersion objective is a specially designed <a href="/facts/Objective_(optics)/6smChS48">objective lens</a> used to increase the <a href="/facts/Optical_resolution/TcLkPYFw">resolution</a> of the microscope. This is achieved by immersing both the lens and the specimen in water which has a higher <a href="/facts/Refractive_index/yjkzvgeE">refractive index</a> than air, thereby increasing the <a href="/facts/Numerical_aperture/EvW1oVBC">numerical aperture</a> of the objective lens. </p>