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Science 8 Reflection in PLANE (Flat) Mirrors What is specular reflection? REFLECTION FROM A SMOOTH SURFACE THAT CREATES AN IMAGE (EX. mirrors, in still water) What is diffuse reflection? REFLECTION FROM A ROUGH SURFACE THAT DOES NOT CREATE AN IMAGE, BUT SCATTERS LIGHT (Ex. frosted glass, paper) What is a PLANE MIRROR? A regular flat mirror Describe the image you see in a plane mirror: Size: The image is the SAME SIZE as the object. Attitude: The image is UPRIGHT (but left and right are reversed) Location: The image is the same distance, but it appears BEHIND the mirror Type: The image is VIRTUAL. The Laws of Reflection: 1st : The angle of INCIDENCE is equal to the angle of REFLECTION 2nd : The angle of incidence, angle of reflection and the normal line all occur in a PLANE (flat surface) point of incidence Science 8 Curved Mirrors Concave Convex Focus or focal point Imaginary Focus It’s also called a converging mirror. It’s also called a diverging mirror. The reflected rays come together and pass Reflected rays spread out. through a focus. “Spread out” means diverge. “Come together” means converge. There is no real focus in a convex (diverging) The point where the reflected rays meet is mirror. It appears that the focal point is behind called the focus. the mirror. Images depend on where the object is located Images are ALWAYS Smaller OR larger smaller Upright OR inverted upright Closer OR farther closer Real OR virtual virtual Concave Convex Examples: Examples: Make – up mirrors – within one focal length, a face is upright and larger Security mirrors in stores give a wide, upright view of people Dentists’ mirrors Give an enlarged, upright image of teeth Reflectors in flashlights – focus light to create a narrower, more concentrated beam Telescope mirrors – large mirrors collect and concentrate light to make stars appear brighter Passenger - side mirrors on cars give the driver a wider view, but distorts distance (“Objects are closer than they appear)