Question

Wavelength

Answer 1

my answer was \[\lambda=\frac{ \lambda _{0}*d }{ (t _{2}-t _{1})*c}\] but the answer is \[\lambda=\frac{ \lambda _{0}*d }{ (t _{2}-t _{1})*c+d}\]
I don't understand why there is a "+d"

Answer 2

I used \[n=c/v\] and \[\lambda=\lambda _{0}/n\]

Answer 3

with \[v=\frac{ d }{ t _{2}-t _{1} }\]

Answer 4

Last assumption wasn't right.

Answer 5

if anyone is interested.

Answer 6

please I call
tau_1 the time employed by light to travel from laser to glass slab
tau_2 the time employed by light to travel from slab to photocell
tau_3 the time employed by light to travel into the glass slab

furthermore, I call:
x the distance between laser and glass slab;
d the thickness of the slab
y the distance between the slab and the photocell,
please look at my drawing: