Question

In the figure, two light pulses are sent through layers of plastic with thicknesses of either L or 2L as shown and indexes of refraction n,-1.63, n2-172, n3-1.65, n4-1.52, n5-1.68, n6-1.65, and n7-1.57. (a) which pulse travels through the plastic in greater time? (b) What multiple of L/c gives the difference in the traversal times of the pulses? Puke Puke (a) Number Units (b) Number Units

Answer 1

we know that

n = c/v => v = c/n

t = L/v

t = nL/c

for

t2 = 1.63 L/c + 1.72 L/c + 1.65 L/c + 1.52 L/c = 6.52 d/c

t1 = 1.68 x 2L/c + 1.65 L/c + 1.57 L/c = 6.58 d/c

t1 > t2

a)t1 takes greater time

b)M = t1 - t2

M = 6.58 - 6.52 = 0.06 L/c

Hence, M = 0.06 (L/c)