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Question

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A 5.00 cm-thick layer of oil is sandwiched between a 1.00 cm-thick sheet of glass and a 2.00 cm-thick sheet of polystyrene plastic. How long (in ns) does it take for light incident perpendicular to the glass to pass through this 8.00 cm-thick sandwich? (Points : 20)

Explanation / Answer

refractive index of oil=1.47

refractive index of glass=1.5

refractive index of polystyrene=1.57

so speed of light in a medium=c/n

where n is the refractive index.

also time=distance/speed

so,

time= 1.47*0.05/(3*10^8) + 1.5*0.01/(3*10^8) + 1.57*0.02/(3*10^8)

=4*10^-10 s

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