A double convex lens has power P and same radii of curvature R of both the surfaces. The radius of curvature of a surface of a plano-convex lens made of the same material with power 1.5 P is: 1) R / 3 2) 3R / 2 3) R / 2 4) 2R
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A double convex lens has power P and same radii of curvature R of both the surfaces. The radius of curvature of a surface of a plano-convex lens made of the same material with power 1.5 P is:
- 1) R / 3
- 2) 3R / 2
- 3) R / 2
- 4) 2R
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- A contact lens is made of plastic with an index of refraction 1.50. The lens has an outer radius of curvature of + 1.65 cm and an inner radius of curvature of + 5.85 cm. What is its focal length? TTTT Paragraph Arial 3 (12pt) E - E - T- 回i 公 T T, Bullet List O f. Mashups- HTML CSSA person sees clearly wearing eyeglasses that have a power of −2.00 diopters when the lenses are 2.30 cm in front of the eyes. (a) What is the focal length of the lens? cm(b) Is the person nearsighted or farsighted? nearsightedfarsighted (c) If the person wants to switch to contact lenses placed directly on the eyes, what lens power should be prescribed? dioptersProblem 102. My wife Margie has lost most of her accommodation. She has a nearpoint of 130 cm and would like to read as close as 40 cm from her eyes. A) What power reading glasses should Margie use? Assume the lenses in the glasses are 2 cm from the eye. B) What is Margie's farpoint while wearing reading glasses?
- An inquiring student makes a refracting telescope by placing an objective lens and an eyepiece at opposite ends of a 46.5 cm long tube. If the eyepiece has a focal length of 1.70 cm, calculate the required focal length in cm of the objective lens and the angular magnification of the telescope. HINT (a) the required focal length in cm of the objective lens cm (b) the angular magnification of the telescopeWhat is the focal length of the lens in your eye when you can focus on an object at your near point? Assume that the distance from your lens to the back of your eye is 2.0 cm, that your near point is 21 cm in front of your lens, and that the liquid behind the lens has n=1.00 just like the air in front of your lens. (a) 1.8 cm (b) 18 cm (c) 2.1 cm (d) 21 cm (e) None of the above.A prescription for an eyeglass lens calls for +3.50 diopters. The lensmaker grinds the lens from a “blank” withand convex front surface of radius of curvature n=1.56of 30.0 cm. What should be the radius of curvature of theother surface?
- Problem 103. A) How do the lenses in glasses designed to correct nearsighted eyes with no astigmatism differ from the lenses designed to correct nearsighted eyes with astigmatism? B) Why can reshaping the cornea with a laser correct the far vision of a nearsighted person?A converging lens with a focal length of 83.5 cm is 1.00 m to the left of a convex mirror with a focal length of 50.7 cm. An object is placed 1.00 m to the left of the lens. (a) Where is the final image located? cm ---Select--- (b) The image is: upright inverted (c) What is the overall magnification?A relaxed emmetropic eye is seen as a thin lens (the crystalline lens) with a focal length f' = 17 mm in front of a screen. a) For near vision, the eye has to accommodate. What is the new focal length in order to be able to see at 25 cm (the near point)? In which way does the curvature of the crystalline vary? b) If the eye could not accommodate at all, what should be the focal length of the lens (glasses) that one should add in order to get a sharp image at this distance?