CONVEX MIRROR
and what if you place a object infront of an convex mirror.. where is the image formed?
..steps..
1.Pick a point on the top of the object and draw two incident rays traveling towards the mirror.
2.Using a straight edge, accurately draw one ray so that it travels towards the focal point on the opposite side of the mirror; this ray will strike the mirror before reaching the focal point; stop the ray at the point of incidence with the mirror. Draw the second ray such that it travels exactly parallel to the principal axis. Place arrowheads upon the rays to indicate their direction of travel.
[..Once these incident rays strike the mirror, reflect them according to the two rules of reflection for convex mirrors.
The ray that travels towards the focal point will reflect and travel parallel to the principal axis. Use a straight edge to accurately draw its path. The ray which traveled parallel to the principal axis on the way to the mirror will reflect and travel in a direction such that its extension passes through the focal point. Align a straight edge with the point of incidence and the focal point, and draw the second reflected ray. Place arrowheads upon the rays to indicate their direction of travel. The two rays should be diverging upon reflection..]
3.Locate and mark the image of the top of the object.
The image point of the top of the object is the point where the two reflected rays intersect. Since the two reflected rays are diverging, they must be extended behind the mirror in order to intersect. Using a straight edge, extend each of the rays using dashed lines. Draw the extensions until they intersect. The point of intersection is the image point of the top of the object. Both reflected rays would appear to diverge from this point. If your were to draw a third pair of incident and reflected rays, then the extensions of the third reflected ray would also pass through this point. This is merely the point where all light from the top of the object would appear to diverge from upon reflecting off the mirror. Of course, the rest of the object has an image as well and it can be found by applying the same three steps to another chosen point
>>image formed..
location:behind the mirror..{virtual}
di..{negative}
magnification..{positive}
position..{upright}
Wednesday, August 8, 2007
converging lens..>
converging lens
1.Ray #1
..runs parallel to the axis until it reaches the lens; then it refracts through the lens and leaves along a path that passes through the lens' principal focus
2.Ray #2
..runs straight through the center of the lens never bending
3.Ray #3
..first passes through the focus until it reaches the lens; then it refract through the lens and leaves parallel to the lens' axis on the other side of the lens
4.the intersection of this rays.. this were the image is located
!!wee sorry for the not clear pics..ill jhuz post a new one,, clear nd easy to see!!
Tuesday, August 7, 2007
Concave mirror..>
CONCAVE MIRROR
when an object is place in front of a concave mirror.. do you know where is its image formed?!?.. XD
here's the steps how to locate the object's image.. XD
1.Pick a point on the top of the object and draw two incident rays traveling towards the mirror.
2.Using a straight edge, accurately draw one ray so that it passes exactly through the focal point on the way to the mirror. Draw the second ray such that it travels exactly parallel to the principal axis. Place arrowheads upon the rays to indicate their direction of travel.
[..Once these incident rays strike the mirror, reflect them according to the two rules of reflection for concave mirrors.
The ray that passes through the focal point on the way to the mirror will reflect and travel parallel to the principal axis. Use a straight edge to accurately draw its path. The ray which traveled parallel to the principal axis on the way to the mirror will reflect and travel through the focal point. Place arrowheads upon the rays to indicate their direction of travel. Extend the rays past their point of intersection..]
3.Mark the image of the top of the object.
The image point of the top of the object is the point where the two reflected rays intersect. If your were to draw a third pair of incident and reflected rays, then the third reflected ray would also pass through this point. This is merely the point where all light from the top of the object would intersect upon reflecting off the mirror. Of course, the rest of the object has an image as well and it can be found by applying the same three steps to another chosen point.
4.Repeat the process for the bottom of the object.
>>image characteristics..
infront of the mirror.. {real image}
di..{positive}
magnification..{negative}
position..{inverted}
Yx.GOLDHY.xY
me
mr
me
me
me
