11. For further information on simple optical telescopes, see Refracting telescope ?Refracting telescope designs. 12. For further information on simple optical telescopes, see Refracting telescope ?Refracting telescope designs. 13. This was especially true in refracting telescopes, before the invention of achromatic objective lenses. 14. From these experiments Newton concluded that no improvement could be made in the refracting telescope. 15. Hadley also developed ways to make precision aspheric and aerial refracting telescopes of the day. 16. -- Light-refracting or bright objects, such as mirrors, lights and crystals. 17. For reasons that may be endemic to photography, this show is like a refracting lens. 18. Hadley had solved many of the problems of making a aerial refracting telescopes of the day. 19. The earliest known working telescopes were the refracting telescopes that appeared in the Netherlands in 1608. 20. Worcester Warner would design the 36-inch refracting telescope installed at Lick Observatory in 1888.
