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science section 4
vocabulary
11
Science
7th Grade
10/20/2009

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Term
light ray
Definition
narrow beam of light traveling in a straight line
Term
medium
Definition
material through which a wave can travel
Term
reflection
Definition
occurs when a wave strikes an object or surface and bounces off
Term
law of reflection
Definition
states that the angle of incidence is equal to the angle of reflection
Term
focal point
Definition
single point in the optical axis of a concave mirror where reflected light rays pass through
Term
focal length
Definition
distance along the optical axis from the center of a concave mirror to the focal point
Term
refraction
Definition
bending of a wave as it moves from one medium to another medium due to a change in speed
Term
lens
Definition
transparent object that has at least one curved surface that causes light to bend
Term
convx lens
Definition
converging lens that is thicker in the middle than at its edges
Term
concave lens
Definition
lens that is thicker at its edges than in the middle and causes light rays traveling parallel to the optical axis to diverge
Term
refracting telescope
Definition
uses 2 covex lenses to gather light and form an image of a distant object
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