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1
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Eye condition with blurred vision as its main symptom.
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2
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A lens having at least one surface curved like the inner surface of a sphere.
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3
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Short sightedness
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4
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The distance between the centre of a convex lens or a concave mirror.
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5
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The point in space where parallel light rays meet after passing through the lens or bouncing off the mirror.
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6
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A lens having at least one surface that curves outward like the exterior of a sphere.
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7
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Far sightedness
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8
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The bending of light as it passes from one substance to another.
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9
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The act of reflecting or the state of being reflected such as light, sound or image.
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