Convex

(adj.) curving or bulging outward .

詹妮校对

• The other is a pad made of aluminum which is concave on one side and convex on the other and may be used in a wet pack. 佚名. 神奇的知识之书.
• Suppose we place an arrow, _A_, in front of a convex lens (Fig. 73). 伯莎M.克拉克. 科学通论.
• Such lenses are called convex or converging lenses. 伯莎M.克拉克. 科学通论.
• Convex glasses, by bending the rays and bringing them to a nearer focus, overbalance a short eyeball with its tendency to focus objects behind the retina. 伯莎M.克拉克. 科学通论.
• Let a convex lens be placed near a candle (Fig. 75); move a paper screen back and forth behind the lens; for some position of the screen a clear, enlarged image of the candle will be made. 伯莎M.克拉克. 科学通论.
• The defect is remedied by convex glasses. 伯莎M.克拉克. 科学通论.
• Kepler studied Galileo’s instrument, and then designed one consisting of two convex lenses. 鲁伯特·萨金特·荷兰. 历史性发明.
• It cannot depend on one, for that must be either convex, or concave, or plain. 鲁伯特·萨金特·荷兰. 历史性发明.
• A camera (Fig. 82) is a light-tight box containing a movable convex lens at one end and a screen at the opposite end. 伯莎M.克拉克. 科学通论.
• The distance of the principal focus from the lens is called the focal length of the lens, and from the diagrams we see that the more convex the lens, the shorter the focal length. 伯莎M.克拉克. 科学通论.
• The last form neither augments nor diminishes visible objects; the concave diminishes them, the convex increases them, but both show them blurred and indistinct. 鲁伯特·萨金特·荷兰. 历史性发明.
• Lenses are very similar to prisms; indeed, two prisms placed as in Figure 69, and rounded off, would make a very good convex lens. 伯莎M.克拉克. 科学通论.
• Farsightedness can be remedied by convex glasses, since they bend the light and bring it to a closer focus. 伯莎M.克拉克. 科学通论.
• It was developed from the convex lens, which, as we have seen in a previous chapter, had been known for centuries, if not from remote antiquity. 李贝. 西洋科学史.

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