The most common type of curved mirror is a spherical mirror A spherical mirror has the shape of a section from the surface of a sphere Curved Mirrors Concave mirror the inside surface of the mirror is polished ID: 273655
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Slide1
Curved Mirrors
The most common type of curved mirror is a spherical mirrorA spherical mirror has the shape of a section from the surface of a sphereSlide2
Curved Mirrors
Concave mirror – the inside surface of the mirror is polishedConvex mirror – the outside surface of the mirror is polishedSlide3
Curved Mirrors
Law of Reflection still applies! angle of incidence = angle of reflection
The normal line is drawn perpendicular to the mirror at the point of incidence.Slide4
Concave Mirrors
C is the center of curvature
R is the radius of curvature (distance between C and the mirror)
Principal axis – a straight line drawn through C and the midpoint of the mirrorSlide5
Concave Mirrors
If the object is infinitely far from the mirror, the rays are parallel to each other and the principal axis
These rays reflect from the mirror and pass through the
focal point, F
f- focal length
is the distance from F to the mirrorSlide6
Concave Mirrors
F is halfway between C and the middle of the mirror
f=1/2RSlide7
Convex Mirrors
F is halfway between C and the middle of the mirror
f=-1/2R
by convention, we use a negative sign for the focal length of a convex mirrorSlide8
The formation of images by mirrors
Light rays emanate from an object, strike the mirror, reflect from it, and form an image.
Ray Tracing is a graphical method of analyzing the image produced by either concave or convex mirrors.Slide9
CONCAVE MIRRORS
RAY1: The ray emanates from the object parallel to the principal axis. It strikes the mirror and reflects through the focal point.Slide10
CONCAVE MIRRORS
RAY2: The ray emanates from the object and passes through the focal point. It strikes the mirror and reflects back parallel to the principal axis.Slide11
CONCAVE MIRRORS
RAY3: The ray travels along a line that passes through the center of curvature, C, strikes the mirror and reflects back on itself.Slide12
CONCAVE MIRRORS
If Rays 1,2 and 3 are superimposed on a scale drawing, they converge at a point that defines the top of the image.Slide13Slide14
CONVEX MIRRORS
RAY1: The ray emanates from the object parallel to the principal axis. It strikes the mirror and reflects but appears to originate from the focal point FSlide15
CONVEX MIRRORS
RAY2: The ray emanates from the object and heads towards F, reflecting parallel to the principal axis after reflection.Slide16
CONVEX MIRRORS
RAY3: The ray emanates from the object and heads towards C, reflecting back on itself.Slide17
CONVEX MIRRORS
The 3 rays appear to come from a point on a
virtual
image behind the convex mirror.