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<http://schema.org/description>
"<h2>Lenses Biconcave Glass - 50mm Dia.</h2>\n<p>Double Concave Spherical lenses 50mm diameter, optically worked glass, with ground. High quality precision finished lenses of different focal lengths for a variety of light and optics experiments.</p>\n<p>Supplied as singles<br></p>"
<https://smartlabs.co.za/products/lenses-biconcave-glass-50mm-1000mm-focal-pk20>