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burgerkin
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Homework Statement
A beam of red light entering a block of glass (n = 1.52) 10.00 miles thick will emerge 1.75 miles ahead of a blue pulse that entered at the same moment.
(a) How long will it take the red light to traverse the glass?
µs
(b) How fast does the blue pulse travel?
m/s
(c) How much time will elapse between the emergence of the red and then the blue?
Homework Equations
v=f[tex]\lambda[/tex]
[tex]\lambda[/tex]1 /[tex]\lambda[/tex]2 =v1 /v2 =n2 / n1
The Attempt at a Solution
Here is what I tried
[tex]\lambda[/tex]=700 nm for red light
700 / x = 1.52 /1
x=461 nm (x is the wavelength when red light passes thru the glass)
then
460nm x 4 x 10^14 =1.84 x 10^8 m/sI am not sure if it is correct, and what really is the distance the red light traveled? 10-1.75 miles??thanks n advance