What is the angle of incidence in the glass?
You should aim the spear below the appar-
ent position of the fish, because the effect of
refraction is to make the fish appear closer to
the surface than it really is.
In in order to zap the fish with a laser, make
no corrections and simply aim directly at the
You are simple reversing the refracted
light-ray path from the fish to you. A slight
correction may be necessary, depending on
the colors of the laser beam and the fish.
While standing on a bank you wish to spear a
fish in front of you.
Would you aim above, below, or directly at
the observed fish to make a direct hit?
on the other hand, you wished to zap the fish
with a laser beam of the same color as the
fish, how would you aim?
None of these
Below; directly at
> p > f
f < q <
> M >
The focal length for a convergent
lens is positive,
Substituting these values into the