英语词汇“virtual focus”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

5. Physics. Of an image: such that the light forming it appears to diverge from a point beyond the refracting or reflecting surface; designating the focus from which such light appears to diverge (chiefly in virtual focus). Contrasted with real adj.² 6; see image n. 3a.

ΚΠ

1692 W. Molyneux Dioptrica Nova ix. 56 Draw g k directly to cross the Axis in e. I call the Point e the Virtual Focus, or Point of Divergence.

1692 W. Molyneux Dioptrica Nova 96 What is here Demonstrated concerning the Real Image of a Convex Glass may be accommodated to the Virtual Image of a Concave.

1728 E. Chambers Cycl. at Point Point of Dispersion, is that wherein the Rays begin to diverge; usually call'd the Virtual Focus.

1808 J. Webster Elem. Nat. Philos. (new ed.) 185 They issued from the virtual focus in the axis of the lens.

1859 S. Parkinson Treat. Optics i. viii. 127 The image of an object under water is virtual.

1913 Science 26 Sept. 445/1 Irrespective of direction, the curvature is considered..negative if from a virtual focus.

2008 G. Jacobs & J. Schulman AP Physics B & C xxiv. 290 A real image can be projected onto a screen, whereas a virtual image cannot.

单词	virtual focus
释义	> as lemmas virtual focus 5. Physics. Of an image: such that the light forming it appears to diverge from a point beyond the refracting or reflecting surface; designating the focus from which such light appears to diverge (chiefly in virtual focus). Contrasted with real adj.² 6; see image n. 3a. ΚΠ 1692 W. Molyneux Dioptrica Nova ix. 56 Draw g k directly to cross the Axis in e. I call the Point e the Virtual Focus, or Point of Divergence. 1692 W. Molyneux Dioptrica Nova 96 What is here Demonstrated concerning the Real Image of a Convex Glass may be accommodated to the Virtual Image of a Concave. 1728 E. Chambers Cycl. at Point Point of Dispersion, is that wherein the Rays begin to diverge; usually call'd the Virtual Focus. 1808 J. Webster Elem. Nat. Philos. (new ed.) 185 They issued from the virtual focus in the axis of the lens. 1859 S. Parkinson Treat. Optics i. viii. 127 The image of an object under water is virtual. 1913 Science 26 Sept. 445/1 Irrespective of direction, the curvature is considered..negative if from a virtual focus. 2008 G. Jacobs & J. Schulman AP Physics B & C xxiv. 290 A real image can be projected onto a screen, whereas a virtual image cannot. extracted from virtualadj.n. < as lemmas
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> as lemmas