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2. Suppose you have a glass lens system that is to be used primarily for 472-nm light. What is the second thinnest coating of fluorite (magnesium fluoride) that would be non-reflective for this wavelength? (Hint: you'll need to look up the indices of refraction in your textbook.) 3. Polarized light is incident on a polarizing filter. After passing through the filter, the intensity of the light has been reduced by a factor of 2.4. What is the angle between the axis of the polarizing filter and the axis of the incident light? 4. A scuba diver sees light reflected from the water's surface. At what angle will this light be completely polarized? If the scuba diver were observing water reflecting from a lake of water of VENUS (where the atmosphere is predominantly carbon dioxide), the answer to the question above would change in what way? Group of answer choices The angle would be slightly higher. The angle would be slightly smaller. The answer would be exactly the same. None of the above. (also, I am bad at logic.) 5. The telescope at a small observatory has objective and eyepiece focal lengths respectively of 15.9 m and 9.63 cm. What is the angular magnification of this telescope? 6. Two lenses are placed a distance of 20.0 cm apart. The leftmost lens is a converging lens with a focal length of 9 cm while the seconds lens is a diverging lends with a focal length of 12. If an object is placed 7 cm to the left of the converging lens, determine the magnification of the two lenses combined.

7. What power contact lens is needed to correct the vision of a person who has a near point of 54.3 cm and allow him to see objects 25.0 cm away? Is this person nearsighted or farsighted? 8. An office administrator realizes that she is having trouble doing her work due to eyesight problems. Her optometrist determines that without glasses she can focus clearly only on objects that lie at distances between 0.541 m and 4.40 m. The optometrist decides that the best way to handle her eyesight problems is to prescribe bifocals that will give her normal visual acuity from 25.0 cm out to infinity. After trying on several pairs of glasses frames, they agree that the glasses will be a distance of 2.5 cm from her eyes. a) Determine the refractive power needed for the bifocal part that will correct for her farsightedness (include the sign) What will the refractive power needed for the part of her bifocal that will correct her nearsightedness? 9. If when an object is placed 25.1cm in front of a mirror the image is located 12 cm behind the mirror, determine the focal length of the mirror. Is the mirror in the previous question convex or concave?