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Light Unit Vocabulary (Law of Reflection/Incident Ray: when light falls…
Light Unit Vocabulary
Law of Reflection/Incident Ray: when light falls upon a plane surface it is so reflected that the angle of reflection is equal to the angle of incidence
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Refraction/Normal: the incident ray, the reflected ray, and the normal to the surface at the point of incidence all lie in the same plane.
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Translucent: Allowing light, but not detailed images, to pass through.
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Lumen: the SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela.
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Point source: A source of energy, such as light or sound, that can be regarded as having negligible dimensions.
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Concave lens and mirror: A concave lens is a lens that possesses at least one surface that curves inwards.
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Converging lens: Curved on both sides. This means the light rays coming out of it come together at a point
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Diverging lens: A lens that causes a beam of parallel rays to diverge after refraction, as from a virtual image; a lens that has a negative focal length.
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