Lenses are made of transparent material such as glass or clear plastics. They have two faces, of which at least one is curved.
TYPE OF LENSES : 1) CONVEX 2) CONCAVE
1) Convex lenses @ converging lenses
THICKER at the center
2 ) Concave lenses @ diverging lenses
THINNER at the center
Nak ingat senang : ingat CONCAVE , ingat CAVE= GUA : so, permukaan akan berbentuk melengkung seperti PINTU GUA..
HOW DOES THE LENSES WORK ??
CONVEX LENSE will CONVERGE RAYS
CONCAVE LENSE will DIVERGE RAYS
HOW ABOUT THE POWER OF LENSES??
The power of a lens is a measure of its ability to converge or to diverge an incident beam of light
Power for a convex lens is positive.
Power for a concave lens is negative
A thin lens with a longer focal length, f has a lower power
A thick lens with a shorter focal length, f has a higher power.
so, can you see the relationship about the thicker and the power??
HOW ABOUT LENSES FORMULA
The magnification of a lens is the ratio of the size of the image to the size of the object
WHAT IS V?? WHAT IS U??
check it dear...:) dont be too lazy yer
ingat..kejayaan x dtg bergolek..USAHA!!!