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单词
ramsden circle
释义
Ramsden circle
Ramsden circle
[
′ramz·dən ‚sər·kəl
]
(optics)
A sharp, bright circle of light which appears on a sheet of white paper held near the eyepiece of a telescope focused for infinity and pointed at a bright sky. Also known as Ramsden disk.
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更新时间:2025/3/17 14:37:27