CURVED MIRRORS: The three light rays ….. straight through the “center” through the focal point, and then (reflect) parallel to the principle axis parallel.

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Presentation transcript:

CURVED MIRRORS: The three light rays ….. straight through the “center” through the focal point, and then (reflect) parallel to the principle axis parallel to the principle axis, and then (reflect) throught the focal point

f 2f concave mirror, object located beyond C: object ray 1a…

f 2f object concave mirror, object located beyond C: ray 2a…

f 2f object concave mirror, object located beyond C: ray 2b…

f 2f object concave mirror, object located beyond C: ray 3a…

f 2f object concave mirror, object located beyond C: ray 3b…

f 2f image concave mirror, object located beyond C: ** image is ….. object ….. smaller, inverted, real, located between f & C

other similar mirror diagrams … except diagram #4 (slide #11) turns out weird

f 2f object image concave mirror, object located at C: ** image is ….. ….. same size, inverted, real, located at C

f 2f object concave mirror, object between f & C: ** image is ….. image ….. larger, inverted, real, located beyond C

f 2f object concave mirror, object located at f: ** image is ….....not found! (2 rays are parallel & never intersect!!) **Thus, there is “no image”, an “undefined image”, or it is also said that the image is “at infinity -  ” 

now for the really weird ones...

f 2f object concave mirror, object between f & mirror: ** image is ….. rays diverge (will never meet at a point) so must be backtracked!

f 2f object rays diverge (will never meet at a point) so must be backtracked! image ….. larger, erect, virtual, located on the other side of the mirror, used for compacts (make-up mirrors) concave mirror, object between f & mirror: ** image is …..

convex mirror (object on convex side): ** image is ….. 2f f object rays diverge so must be backtracked!

convex mirror (object on convex side): ** image is ….. 2f f object rays diverge so must be backtracked! image ….. smaller, erect, virtual, located behind mirror, used in conven. & dept. stores; & on school busses

Prove to yourself that those three rays all do follow the Law of Reflection (recall from the rainbow activity that the normal is the line straight through C). Can you do them on your own - without looking, as you’ll be asked to on the test?? Coming up next: equations...

Optics Equations:Optics Equations: 1/f = 1/d O + 1/d I AND m = h O /h I =  d O /d I HW: Assume f = 10 cm (note f is negative for convex mirrors) & h O = 1 cm. Now prove all 6 mirror diagrams!! (You’ll have to pick a good d O each time. A negative d I answer means a virtual image & you can compare the actual # to the d O you picked to verify exact location; a negative h I answer means an inverted image & you can compare the actual # to the h O to tell if smaller/larger/etc)