Angle of refraction through a prism

AI Thread Summary
The discussion revolves around a physics problem involving the angle of refraction of light through a glass prism. A laser emits light with a wavelength of 570 nm, which takes 17.5 ns to travel through air but 20.7 ns when passing through a glass slab. The calculations involve applying Snell's law to determine the angle of refraction, with results showing slight discrepancies in values. Participants note that the problem statement does not align with the discussion title, indicating a potential mix-up in the problem being addressed. The conversation emphasizes the importance of accurately referencing problem statements in physics discussions.
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
 
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Check the problem text. It has nothing common with the title of the thread or the solution. Have you copied a different problem by mistake :) ?
 
oh wow, didn't even see that.
thanks
 
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