Piano-convex sentence example

  • It consists of a piano-convex field-lens of crown glass.
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  • Wollaston altered this by taking two piano-convex lenses, placing the plane surfaces towards each other and employing a diaphragm between the two parts (fig 5).
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  • In the Ramsden eyepiece (see Microscope) the focal lengths of the two piano-convex lenses are equal, and their convexities are turned towards one another.
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