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18. Calculate the index of refraction n for a substance through which light travels with v = 2.055 x 108m. Using this table of refractive indices, identify this medium. A) Polycarbonate C) Pyrex B) Polymethyl methacrylate D) Polylactic acid 19. Using either a mirror or a lens, a real image will always A) appear right side up. B) appear upside down (inverted). C) appear larger than the original object. appear smaller than the original object. D) For Questions 20-23 below, use these multiple choices: A) Concave lens only. B) Convex lens only. C) Both concave and convex lenses. Neither concave nor convex lenses. D) 20. Light converges toward a real focus. 21. Can form virtual images. 22. Can only form images with M > 1. 23. Corrects near-sightedness. 24. When you shine white light through a triangular glass prism, white light emerges, unbent. A) B) the colors are dispersed according to wavelength. Red light, having the longest wavelength, bends the least. the prism scatters the blue light, and only red light C) emerges. D) Don't do it!! Do the words Bermuda Triangle mean nothing to you? 3