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Lenses and Mirrors
Question | Answer |
---|---|
lens | transparent material with a curved surface that reflects light rays |
telescopes | use mirrors and lenses to gather more light from far away objects than the eye does |
microscopes | use two convex lenses with short focal lengths to magnify small, close objects |
cameras | gather and bend light with a lens to form an image on light-sensitive film |
shape of concave lens | thinner in middle than at edges |
how does a concave lens cause the light of bend? | light waves refract (bend) toward the center and meet at a focal point |
type of image formed by concave lens | real or virtual |
focal length | Distance from lens to where light comes into focus |
Two main types of lenses | Convex and concave |
Plane mirror | Flat, smooth mirror in which an image appears upright |
Concave mirror | Mirror surface is curved inward; light rays come together when reflected |
convex mirror | mirror curved outward; light rays spread out when reflected; virtual images |
Another name for convex lens | converging |
Another name for concave lens | Another name for concave lens |
Focal length | Distance from the lens to where the light comes into focus |
Which type of lens refracts light? | Both concave and convex |