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james.rg
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Homework Statement
In a physics lab, light with a wavelength of 570nmtravels in air from a laser to a photocell in a time of 17.5ns . When a slab of glass with a thickness of 0.890m is placed in the light beam, with the beam incident along the normal to the parallel faces of the slab, it takes the light a time of 20.7ns to travel from the laser to the photocell.
What is the wavelength of the light in the glass?
Homework Equations
snell's law (ni)sin(Θi)=(nr)sin(Θr)
The Attempt at a Solution
1sin70°=1.53sinΘ Θ=37.89°
1sin70°=1.525sinΘ Θ=38.04°
38.04°-37.89°=.15°
Fairly sure what I've done is wrong though