Unit C

• four properties of light - travels in a straight light - is a form of energy - can bend - can be reflected
• optical device- any device that uses light
• concave - a curved surface that is thinner at the center than at the edges. close - big and upright - far - image is big and upside down
• convex spreads out light rather then collects - middle in thicker then outer rim
• law of reflectant- rays of incidents are parallel to the ray of reflction
• speed -wavelenth x freqency
• frequecy is how many times the meduim vibrates in a given period of time
• small waves- higher frequesncy
• radio waves- used for communication around world
• micro waves- frenquency is higher , used for microwaves
• ultra violet rays- caries more energy then vissible
• gamma rays- can penitrate tissue- x rays- highest frequency
• how do you produce white light - combining all colors in prism
• properties of a wave, amplitudes, wavelenght, freqyency, speed
• retna- photoreceptors
• pupil- the opening of the eye that allows light to enter the eye
• iris- band of muscle that controls size of pupil
• photo receptors -cones -detect color - rods , detect motion and light
• florecent- mercury vapor - banned
• incondecent -flashlghts, extreme tempuratures
• phospherecent - obsorbes and produced light
• bioluminecent- produce light by a chemical reaction