PASCO OS-8500 INTRODUCTORY OPTICS SYSTEM User Manual
Page 24
Introductory Optics System
012-02744K
®
18
➁ At what angle of refraction is the color separation a maximum? ____________________
_______________________________________________________________________.
➂ What colors are present in the refracted ray? (Write them in the order of minimum to maxi-
mum angle of refraction.)
__________________________________________________
_______________________________________________________________________.
➃ Measure the index of refraction of acrylic for red and blue light
(n
acrylic
sin
θ
acrylic
= n
air
sin
θ
air
).
➤NOTE: In Experiment 4 we said that the index of refraction of a given material is a
constant. That statement was almost accurate, but not quite. As you can see, different
colors of light refract to slightly different angles, and therefore have slightly different
indexes of refraction.
n
red
= ______________________________________.
n
blue
= ______________________________________.
Total Internal Reflection
Without moving the Ray Table or the Cylindrical Lens, notice that not all of the light in the
incident ray is refracted. Part of the light is also reflected.
➀ From which surface of the lens does reflection primarily occur? ___________________
________________________________________________________________.
➁ Is there a reflected ray for all angles of incidence? (Use the Viewing Screen to detect faint
rays.)
_________________________________________________________________
________________________________________________________________.
➂ Are the angles for the reflected ray consistent with the Law of Reflection? __________
________________________________________________________________.
➃ Is there a refracted ray for all angles of incidence?____________________________
________________________________________________________________.
➄ How do the intensity of the reflected and refracted rays vary with the angle of incidence?
________________________________________________________________.
➅ At what angle of refraction is all the light reflected (no refracted ray)? ______________
________________________________________________________________.