Lab
Least Time Activity
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Refer to the following information for the next eight questions.
Measure each of the following distances if a beam of light traveled each path.
PA = ____ cm
PB = ____ cm
PC = ____ cm
PD = ____ cm
AS = ____ cm
BS = ____ cm
CS = ____ cm
DS = ____ cm
Refer to the following information for the next four questions.
Time calculations using t = nd/c where c = 3 x 10
^{8}
m/sec.
time
_{PA + AS}
= ____ sec
time
_{PB + BS}
= ____ sec
time
_{PC + CS}
= ____ sec
time
_{PD + DS}
= ____ sec
Refer to the following information for the next two questions.
Determine which path (PBS or PCS) requires the least time. If PBS has the least time, construct a normal at B. If PCS has the least time, construct a normal at C. Measure the angles between the top ray (
q
_{1}
) and the bottom ray (
q
_{2}
) with the normal.
q
_{1}
= _____
q
_{2}
= ____
Refer to the following information for the next two questions.
Use Snell's Law (n
_{1}
sin
q
_{1}
= n
_{2}
sin
q
_{2}
) calculate an experimental value for the index of the second medium and then give a percent error against the accepted value of 1.5.
experimental n
_{2 }
= _____
percent error = ____
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