Honors Physics

# Questions - Week 35

1. One piece of plastic has a refractive index of 1.45. A second piece of plastic has a refractive index of 1.35. In which is the speed of light greater?
2. A ray of light passes from a material with n = 1.25 into a material with n = 1.45. If the angle of refraction is 39 degrees, what is the angle of incidence?
3. If light passes from a material with n = 1.35 into a material with n = 1.55, what is the critical angle?
4. What is the meaning of a negative image distance? A negative focal length? A negative magnification?
5. Sketch a ray diagram showing a converging lens with the object distance less than the focal length.
6. Take a diverging lens with a focal length of 12 cm. Place an object 22 cm from the lens. Calculate the image distance and magnification.
7. If someone is near-sighted, are they able to see things nearby or far away?
8. What makes an eye near-sighted? What kind of lens is required to correct this?
9. What makes an eye far-sighted? What kind of lens is required to correct this?