1) Bonded together 2) Bound together 3) Completely set 4) Covered 5) Fixed firmly 6) Lined 7) No longer in doubt 8) Smooth 9) Tiled 10) United firmly Found on https://www.crosswordclues.com/clue/cemented
The components of most small achromatic lenses are glued together ('cemented' together) with a transparent adhesive. Canada balsam was the traditional adhesive, but it has been somewhat replaced by modern, UV-curing adhesives Found on http://www.irpoyser.co.uk/glossary.php