WHAT IS WRONG WITH MY FINGERS TODAY?
NO, I DID NOT DRINK TOO MUCH. ONE
REASON IS THAT MY USUAL MAILER DOES
NOT WORK; I AM USING WEBMAIL. BUT
THAT IS NOT A VALID EXCUSE.
Those who use College Physics of
Serway (6th edition) probably
noticed that the sign convention
for q (for spherical mirrors) is
wrong on page 720. Check this via
the example on p 723. The
convention used to interpret the
resulting q is correct in the
example but not in Table 23.1
P.S.
The general rule, with only one
exception, is that an image of a
real object produced by a mirror
is virtual and upright. It is always
true for flat mirrors, it is always
true for convex mirrors and it is
true for concave mirrors when
p<f=R/2. The only exception is a
CONCAVE mirror for p>f. In that case
the image is real and inverted.
Try to find a situation in which the
image (of an arrow facing a mirror)
is "real but not inverted," or that
is "virtual and inverted." In other
words, virtual images are always
uprig
ht while real images are always
inverted Do you agree with this?
Ludwik Kowalski