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Light Waves Sec 1
Light Waves Strike objectsReflected Absorbed Transmitted
Properties of objects Opaque Transparent Translucent
Opaque A material that reflects or absorbs all of the light that strikes it.
Transparent Material transmits lightLight passes through allowing you to see what is on the other side
Translucent Some light passes throughMaterial scatters light as the light passes through You cannot see details
Reflection Two kinds of wave reflection Regular and Diffused
Regular Reflection Occurs when parallel rays of light hit a smooth surface All the rays are reflected at the same angel
Diffuse Reflection When parallel rays of light hit a bumpy, or uneven surface The rays are reflected at different angels
Mirrors Sheet of glass Smooth, silver-colored coatingWhen light passes through the mirror, the back coating causes the light to reflect regularly, allowing you to see an image
Image Is a copy of an object formed by reflected or refracted rays of light
Plane Mirror Flat mirror Produces a image that is right-side up andThe same size as the object being reflected
Virtual Image The image you see when you look in a plane mirror is a virtual image Right-side up or upright
Concave Mirrors Surface curves inwardCan form virtual images, real images, or no image Depends on position of the object in relation to the focal point
Real Image Formed when rays actually meet at a pointThe images are upside down, or inverted
Focal Point The point at which the rays meet
Convex Mirrors A mirror with a surface that curves outwardImages are always virtual
Refraction and Lenses Sec 2
Index of refraction measure of how much a ray of light bends when it enters that material
Mirages Is an image of a distant object caused by refraction of lightPage 245
Concave lens Is thinner in the center than at the edges
Convex lenses Is thicker in the center than at the edges
Color Sec 3
Color The color of an object is the color of light it reflectsWhite=reflects all colors Black= absorbs all colors
Primary Colors Three colors that can be used to make any other colorRed, green, and blue Any two primary combined in equal amounts produce a secondary color
Seeing Light Waves Sec 4
The Eye Organ System Each part plays an important part in helping you see
Cornea Light enter the eye through this transparent surfaceThe cornea protects the eye It also acts as a lens bending light waves as they enter the eye
Iris Is a ring of muscle that contracts and expandsThis changes the amount of light that enter the eye Also give the eye color
Pupil Looks black As light dims, the pupil enlarges allowing in more light Vis versa
Lens Behind the pupil Refracts light, forming and image Page 257
Retina Layer of cells lining the inside of the eyeContains many of tiny, light-sensitive cells called, rods and cones
Rods Rods contain pigments that react to small amounts of lightImportant for seeing at night
Cones Respond to color Three types: red, blue, and greenFunction with bright
Optic Nerve The signals generated by the rods and cones travel to the brain along a short, thick nerve The brain turns the image right-side up
Correcting Vision Lenses in glasses are either concave or convexThe type of lens used depends on whether the eye is too long or too short
Nearsightedness Person can see nearby things clearly, but objects at a distance appear blurry Eyeball is a little to long Concave lens correct this
Farsightedness Person can see far away, but objects nearby appear blurry Eyeball is too short This is corrected with convex lenses
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