In a physics lab, light with wavelength 486 nm travels in air
from a laser to a photocell in 17.0 ns. When a slab of glass 0.850
m thick is placed in the light beam, with the beam incident along
the normal to the parallel faces of the slab, it takes the light
21.3 ns to travel from the laser to the photocell. What is the
wavelength of the light in the glass?
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