1. A beam of light enters a glass material at an angle of 20 degrees the refract

Question

1. A beam of light enters a glass material at an angle of 20 degrees the refracted angle of the beam of light is 34 degrees. What is the refractive index of the glass if the light beam is traveling through air initially?

2. A laser is shined through a 500 line/ mm diffraction grating and produces 3 orders of diffraction. If the second order has a degrees what is the wavelength of the light?

3. A beam of light passes through polarized lens if the initial intensity of the light is 70% and the polarized is at an angle of 30 degrees, what is the actual intensity of the light after it passed through the polarizer.

4. If a light with the passes through a diffraction grating that is .23 m from the screen. If the 3rd order point is .2 m away from the 0th order. What is the diffraction gratings distance between lines?

5. Explain why a light beam splits and becomes separate points when passing through a diffraction grating.

6. Charles like to fish the old fashion way, with a sharp stick. If Charles sees a fish in the water and throws his stick exactly where he sees the fish, will he hit the fish or miss it? Explain your reasoning.

7. Why can’t you wear polarized sunglasses while piloting an aircraft?

8. In one sentence explain particle wave duality.

Explanation / Answer

1) given

angle of incidense, theta_i = 20 degrees

angle of refraction, theta_r = 34 degrees

n1(glass) = ?

n2(air) = 1

Use Snell's law

sin(theta_i)/sin(theta_r) = n2/n1

sin(20)/sin(34) = 1/n1

==> n1 = sin(34)/sin(20)

= 1.635 <<<<<<<-----------Answer

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