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science 2-3
vocab cards
14
Science
7th Grade
09/20/2009

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Term
reflection
Definition
the bouncing back of an object or wave when it hits a surface through which it cannot pass
Term
law of reflection
Definition
the rule that the angle of reflection equals the angle of incidence
Term
plane mirror
Definition
a flat mirror that produces an upright virtual image the same size as an object
Term
image
Definition
an image is a copy of an object formed by reflected or refracted rays of light
Term
virtual image
Definition
an upright image formed where rays of light appear to meet or come from
Term
concave mirror
Definition
a mirror with a surface that curves inwards
Term
optical axis
Definition
an imaginary line that divides a mirror in half
Term
focal point
Definition
the point at which light rays parallel to the optical axis meet or appear to meet after being reflected (or  refracted) by a mirror or a leans
Term
real image 
Definition
an upside down image formed where rays of light meet
Term
convex mirror
Definition
a mirror with a surface that curves outwards
Term
refraction
Definition
the bending of waves as they enter a new medium at an angle
Term
lens
Definition
a curved piece of glass or other transparent material that is used to refract light the flexible structure that focuses light that has entered the eye
Term
convex lens
Definition
a lens that is thicker in the center than at the edges
Term
concave lens
Definition
a lens that is thinner in the center than at the edges
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