“Day or night” telescopes were commonly used aboard ships in the early 1800s. The large objective lens was designed to increase the amount of light allowed in, making dim images at night appear visible from a distance. Learn more in this video.
“Day or night” telescopes were commonly used aboard ships in the early 1800s. The large objective lens was designed to increase the amount of light allowed in, making dim images at night appear visible from a distance. Learn more in this video.
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