An optometrist prescribes glasses with a power of – 4.0 D for a nearsighted student. What is the focal length of the glass lenses?
Answer to relevant QuestionsA plastic convex meniscus (Fig. 23.14) contact lens is made of plastic with an index of refraction of 1.55. The lens has a front radius of 2.50 cm and a back radius of 3.00 cm. (a) The signs of R1 and R2 are (1) +, +, (2) ...A biconvex lens is made of glass whose index of refraction is 1.6. The lens has a radius of curvature of 30 cm for one surface and 40 cm for the other. Calculate the focal length of this lens as used in air and under water. A woman 1.7 m tall stands 3.0 m in front of a plane mirror. (a) What is the minimum height the mirror must be to allow the woman to view her complete image from head to foot? Assume that her eyes are 10 cm below the top of ...Two parallel slits are illuminated with monochromatic light, and an interference pattern is observed on a screen. (a) If the distance between the slits were decreased, would the distance between the maxima (1) increase, (2) ...Magnesium fluoride (n = 1.38) is frequently used as a lens coating to make nonreflecting lenses. What is the difference in the minimum film thickness required for maximum transmission of blue light (λ = 400 nm)and of red ...
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