- #1
laurieke
- 4
- 1
Homework Statement
In a physics lab, light with a wavelength λ0 travels in vacuum from a laser to a photocell in a time t1. When a slab of glass with a thickness d 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 t2 to travel from the laser to the photocell (again in vacuum). The speed of light in a vacuum is c.
9. What is the wavelength of the light in the glass? Express your answer in the given constants.
Homework Equations
labda = labda0 / n
n = c/v
v=x/t
The Attempt at a Solution
so i said that v = x/t equals d/(t2-t1)
n = c/v so together with the above equation n = c(t2-t1)/d
i filled this in at the first equation labda/ labda0 / n and with this i got to the answer:
labda = labda0*d/c(t2-t1)
the answer on the other hand is : labda0*d/c(t2-t1)+d , i am very close but i can not figure out where the +d comes from
Last edited by a moderator: