chp 19 noahgrace

light ray

a narrow beam of light that travels in a straight line
medium

medium

material through which a wave travels

opaque

materials that let no light pass through them

translucent

material you can see clearly through such as glass and clear plastic that allows nearly all the light that strikes them to pass through

transparent

material that allows some light to pass through. Objects behind material are visible but not clear

law of reflection

the angle of incidence is equal to the angle of reflection. This is true for any surface no matter what material it's made of

focal point

light rays that travel parallel to the optical axis and strike the mirror are reflected so that they pass through a single point on the optical axis

focal length

the distance along the optical axis from the center of the mirror to the focal point

lens

a transparent object with at least one curved side that causes light to bend

concave lens

a lens that is thicker at the edges than in the center

refracting telescope

uses two convex lenses to form an image of a distant object. Light passes through an objective lens that forms an image

reflecting telescope

have a concave mirror instead of a concave objective lens to gather light from distant objects

light ray

a narrow beam of light that travels in a straight line
medium

medium

material through which a wave travels

opaque

materials that let no light pass through them

translucent

material you can see clearly through such as glass and clear plastic that allows nearly all the light that strikes them to pass through

transparent

material that allows some light to pass through. Objects behind material are visible but not clear

law of reflection

the angle of incidence is equal to the angle of reflection. This is true for any surface no matter what material it's made of

focal point

light rays that travel parallel to the optical axis and strike the mirror are reflected so that they pass through a single point on the optical axis

focal length

the distance along the optical axis from the center of the mirror to the focal point

lens

a transparent object with at least one curved side that causes light to bend

concave lens

a lens that is thicker at the edges than in the center

refracting telescope

uses two convex lenses to form an image of a distant object. Light passes through an objective lens that forms an image

reflecting telescope

have a concave mirror instead of a concave objective lens to gather light from distant objects