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Ch18 Light
Light
| Question | Answer |
|---|---|
| Transparent Material | light passes through without being scattered |
| Translucent Material | scatters light as it passes through |
| Opaque Material | reflects or absorbs light as it passes through it |
| Primary Color | three colors that combine to make a color |
| Secondary Color | two primary colors that combine in equal amounts to make a secondary color |
| Complementary Color | any two colors that can combine to make white light |
| Pigment | colored substances that are used to color other materials |
| Ray | a straight line used to represent a light wave |
| Regular Reflection | when all light ray are reflected at the same angle because of the smooth surface |
| Diffuse Reflection | A reflection that occurs when rays of light that are parallel hit a rough surface and go into different directions. |
| Plane Mirror | A flat mirror which produces a virtual |
| Image | A copy of an object which is formed by reflected/refracted light rays. |
| Virtual Image | Upright image formed where light rays meet or come from. |
| Concave Mirror | An inward curving mirror. |
| Optical Axis | Imaginary line dividing a mirror in half. |
| Focal Point | The point where rays of light parallel to the optical axis meet after being reflected. |
| Real Image | Upside down image formed where light rays meet. |
| Convex Mirror | A mirror with an outward curving surface. |
| Index of Refraction | A measure of how much a ray of light bends when it enters a certain material. |
| Mirage | An image of a distant object caused by refraction of light. |
| Lens | A curved piece of glass or other transparent material that is used to refract light. |
| Convex Lens | A lens that is thicker in the center than it is at the edges. |
| Concave Lens | A lens that is thicker at the edges than in the center. |
| Cornea | A section of the eye that protects it and helps focus light rays. |
| Pupil | An opening through which light enters the inside of the eye. |
| Iris | A ring of muscle that contracts and expands to change the size of the pupil and gives the eye color. |
| Retina | A layer of cells that lines the inside of thr eyeball. |
| Rods | Cells that contain a pigment that responds to small amounts of light. |
| Cones | Cells that respond to color. |
| Optic Nerve | A short |
| Nearsighted | A description of a person who can see nearby object but distant objects appear blurred because the eyeball is too long. |
| Farsighted | A description of a person that can see objects that can see distant objects but nearby objects are blurry because the eyeball is too short. |
| Telescope | An optical instrument that forms pictures of enlarged objects that are distant. |
| Refracting Telescope | A telescope that has two convex lenses |
| Objective | The piece of a telescope that gathers light from an object that comes from an object and focuses the rays to form an image. |
| Eyepiece | The lense close to you eye |
| Reflecting Telescope | uses large concave mirror to gather light |
| Microscope | an optical instrument that forms enlarged images of tiny objects |
| Camera | uses one or more lenses to focus light |
| Laser | a device that produces a narrow beam of coherent light |
| Hologram | a three-dimensional photograph created by using light from a laser |
| Optical Fiber | long |
Created by:
redzone31
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