A few applications of large optical telescopes are stargazing and astronomical research. A few of the most famous optical telescopes are the Hubble Space Telescope and the telescope at the United States Naval Observatory in Washington, D.C. which discovered Mars’ moons Phobos and Deimos (What Are Optical Telescopes Used For?, n.d.).
“The Hubble Space Telescope is a Cassegrain reflector telescope. That just means that light enters the device through the opening and bounces off the primary mirror to a secondary mirror. The secondary mirror in turn reflects the light through a hole in the center of the primary mirror to a focal point behind the primary mirror” (How Hubble Space Telescope Works, 2000). Below is a photo of the Hubble Space Telescope.
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