Opera glasses (English spelling)
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Small, portable binoculars used for theater, etc. Most are Galilean, consisting of an achromatic convex objective lens and a concave eyepiece lens, and have a magnification of 2.5 to 4 times. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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観劇などに用いられる携帯に便利な小型の双眼鏡。色消し凸の対物レンズと凹の接眼レンズから成るガリレイ式のものが多く，倍率は 2.5～4倍。
出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
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