Chapt. 35
Geometrical Optics
271
b) Now say that you tip your corner reflector so that the corner is at the bottom and the
reflector is symmetrical about a vertical axis. You fill the reflector with water assuming
there is some end panes to hold the water in.
In this case what is the twodimensional
deflection angle for a beam coming in from infinity, reflected twice, and deflected out to
infinity?
HINT:
Reduce the problem to that of part (a) and make use of the law of
refraction.
035 qfull 10300 3 5 0 tough thinking: the rainbow, focusing
Extra keywords:
stationary points
4. You have a spherical drop of water and draw a horizontal axis through its center. A beam of
light travels to the right and is parallel to the axis. It strikes the drop at an angle
θ
relative to
the normal to the drop. Inside the drop the beam is deflected at an angle
θ
refr
relative to the
normal using the usual incident/refracted beam conventions. Draw a big, clear diagram.
a) Using geometry (e.g., the isosceles triangle theorem), and the laws of reflection and
refraction find an expression in terms of
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 Fall '06
 Buchler
 Physics, Drop, Stationary point, total angular deflection, usual incident/refracted beam

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