PhysicsLAB Lab
Least Time Activity

 
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 108 m/sec.
timePA + AS = ____ sec 

timePB + BS = ____ sec 

timePC + CS = ____ sec 

timePD + 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 (n1 sin q 1 = n2 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 n2 = _____ 

percent error = ____ 





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