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6th Grade Ch 19

Light, Mirrors, and Lenses

TermDefinition
light ray a narrow beam of light that travels in a straight line
electromagnetic wave waves created by vibrating electric charges that can travel through space or through matter
medium the material through which a wave travels
transparent materials that let nearly all light pass through them
translucent allows only some light to pass through
opaque materials that let no light pass through them
law of reflection states that the angle of incidence is equal to the angle of reflection
focal point point on the optical axis of a mirror or lens where rays traveling parallel to the optical axis pass through
focal length distance along the optical axis from the center of a mirror or lens to the focal point
concave lens lens that is thicker at the edges than it is in the middle
convex lens lens that is thicker in the middle than it is at the edges
refraction bending of a wave as it changes speed while passing from one medium to another
lens a transparent object with at least one curved side that causes light to bend
concave mirror mirror with a surface that curves inward; causes light rays to converge
convex mirror mirror with a surface that curves outward; causes light rays to diverge
Created by: MsHollinger