Francesca has a far point of infinity and near point of 50 cm. What refractive power glasses would be prescribed so Francesc can read a book at 25 cm away, in Diopter? Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

IP The greatest refractive power a patient's eyes can produce is 43.7 diopters. n/a Submit Submitted, grade pending Part C Previous Answers If this patient is nearsighted, find the far point. If this person is farsighted, find the near point. N = 2.3 Submit V— ΑΣΦ www Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining ? Review cm

(Dove Prism) A new type of prism inverts an image that comes in through one end (see Figure 1). The prism will be shaped like a trapezoid with a square cross-section and sides cut at a 45° angle, and that the prism will be made of a plastic called BK7 that has an index of refraction of 1.517. Decide on the dimensions of the prism in order to maximize the size of the image that can be inverted (see incoming/outgoing rays in the side view in Figure 2). How long (length B in Figure 1) should the prism be in terms of its height (length A in Figure 1)? What happens to an image that enters the prism on one side of its long face (see figure 3)? Make a drawing tracing the path of rays 4, 5, and 6 in figure 3 to find out. Figure 1 Figure 2 1 3 2 45° 3 1 Figure 2 Figure 3 45° Figure 3 4 5 6

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