rays, A line of energy that continues in one direction until it hits the object, reflect, When light bounce of the surface, refract, Light rays bends when they enter the medium, absorb, Light is to take in and does not reflect or bent, pupil, Black hole in the center of the eyes that let the light in, lens, Part of the eye that bends and focus the light, retina, Part of the eye that receives the image from the lens and send the message to optic nerve, optic nerve, Part of the eye that send message to the brain, transparent, An object that all light passes through, translucent, An object that some light may passes through, opaque, An object that no light can pass through,  signal, A kind of message or information, transmitter, Part of a device that send out radio signal, antenna, Part of the device that takes in the radio waves, receiver, It convert the radio waves into usable message, digital, A kind of signal that use clear cut values such as numbers, analog, A signal that send message in a continuous stream, X-Ray, Machine in the airport that can see what is inside the bag or luggage, symbol, You can see this in map and it has picture and letters and colors that represents something, legend, Part of map that is the key to symbol, compass, It a device that shows the direction in the map, scale, It shows the distance a map covers, features, It means the characteristics or part of something, physical map, Map that will shows the landforms and bodies of water area of place, political map, Map that will show the countries, states, provinces and capital city,  street map, Map that focus on the streets, road map, Map that will show the road and high way, resource map, Map that will show the products of an area, topography map, Map that will show the elevation of place, satellite map, Map that shows the birds eye view of a place or how can we see the place in the outer space.

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