Optics
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Optics
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21 Questions

1. If a person were nearsighted, what shape lens would correct the person’s vision?
2. When a beam of light is refracted through a prism, the beam is spread into what colors?
3. Why do a cat’s eyes glow in the dark?
4. Why does a piece of glass disappear when immersed in a liquid with the same index of refraction?
5. To correct for chromatic aberration, what type of lens should be used?
6. Which color is refracted most when shone on water?
7. To correct for chromatic aberration, what type of lens should be used?
8. What is the focal point of a concave mirror with a radius of 100 cm?
9. How does a “one-way” mirror work?
10. Which color is refracted most when shone on water?
11. What is the focal point of a concave mirror with a radius of 100 cm?
12. The Hubble Space Telescope is a reflecting telescope. Why was it placed in space?
13. If you stand centered between two mirrors that are 2 m apart, how far away will your image appear in the mirror? How many images will you see?
14. A person with astigmatism has an eye lens that is not spherical. How can this be corrected?
15. To keep as much of the laser beam energy inside a laser fiber, a coating is sometimes placed on the fiber to produce total reflection in the fiber. What refractive index should the coating have?
16. When a beam of light is refracted through a prism, the beam is spread into what colors?
17. The Cerro Paranal telescope array in southern Chile uses four 8.2-m diameter reflecting telescopes. The site is in the Andes Mountains at 2,600 m above sea level. It is approximately 120 km from the nearest town of any significant size. Why is this a good site for a light telescope? Why isn’t it?
18. Galileo made a telescope to study the heavens. The telescope has a 37-mm diameter plano-convex objective lens with a focal length of 980 mm. According to Galileo’s writings, the original eyepiece, which was lost, was a plano-concave lens with a diameter of approximately 22 mm and a focal length of approximately 50 mm. What was its magnification and how did the image appear?
19. What kind of lens should be used to correct eyes with presbyopia (i.e., a condition in which the lens of the eye is unable to focus)?
20. A spherical concave mirror has a focal length of 200 cm. If it is used for stargazing, how far from the mirror will the star images appear?
21. Historians have recorded that Archimedes used mirrors or lenses to burn the Spartan fleet. If he had used mirrors, what would be the focal length of the mirrors Archimedes used to burn the Spartan ships 2 km at sea? Could these be easily made?

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