In a double-slit experiment, the slits are illuminated by a monochromatic, coherent light source having a wavelength of 599 nm. An interference pattern is observed on the screen. The distance between the screen and the double-slit is 1.69 m and the distance between the two slits is 0.114 mm. A light wave propogates from each slit to the screen. What is the path length difference between the distance traveled by the waves for the seventh-order maximum (bright fringe) on the screen

answer: i pick a

explanation:

b.a device that inputs heat into a cool object

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.