- #1
sghaussi
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Hi! I was wondering if you can give me some adivice on how to approach this problem:
In a physics lab, light with a wavelength of 560 nm travels in air from a laser to a photocell in a time of 16.5 ns. When a slab of glass with a thickness of 0.860 m 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 21.3 ns to travel from the laser to the photocell.
What is the wavelength of the light in the glass?
Use 3×108 m/s for the speed of light in a vacuum.
My main problem is that I don't know how the thickness of the medium is important.
Thank you in advance,
Sahar
In a physics lab, light with a wavelength of 560 nm travels in air from a laser to a photocell in a time of 16.5 ns. When a slab of glass with a thickness of 0.860 m 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 21.3 ns to travel from the laser to the photocell.
What is the wavelength of the light in the glass?
Use 3×108 m/s for the speed of light in a vacuum.
My main problem is that I don't know how the thickness of the medium is important.
Thank you in advance,
Sahar