Light rays that enter your eye are affected by the fluid that fills the eyeball,

Question

Light rays that enter your eye are affected by the fluid that fills the eyeball, called the vitreous humor (Figure 1) . When red light from a =633nm helium–neon laser enters your eye, its wavelength drops to 474 nm. Use this information to calculate the index of refraction of the vitreous humor and the speed and frequency of light passing through it.

Now you rotate the polarizing axes so they are at a 65 angle relative to each other. What is the intensity of the light emerging from the second polarizing lens (in terms of I0)? Express your answer to two significant figures.

Explanation / Answer

n ( index of refraction) =633nm / 474 nm = 1.33

velocity in vitreous humor = 3x 10^8 / 1.33= 2.25 x 10^8 m/s

2.25 x 10^8 m/s = ( 474 x 10^-9) (frequencY)

frequency = 0.00476 x 10^ 17 = 4.76 x 10^ 14 hz

I = Io cos^2 ( theta)

I = Io cos ( 65)^2= 0.1786 Io

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