A sliding glass door is installed in a family room that leads to an outdoor deck. The sliding door has one 4 ft (1.22 m) sliding section and one 4 ft (1.22 m) permanently mounted glass section. For inside the recreation room, what does the Code say about wall receptacle outlets relative to the receptacle's position near the sliding glass door?

nah.   i'm just sleepy.

d eras and periods

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.