Suppose you have a 0.750 D prescription for contact lenses.a. What’s your near point?b. What would your prescription be, in diopters, for glasses worn 2.20 cm from the eyes?
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Suppose you have a 0.750 D prescription for contact lenses.
a. What’s your near point?
b. What would your prescription be, in diopters, for glasses worn 2.20 cm from the eyes?
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- Two converging lenses having focal length of f1 = 10.0 cm and f2 = 20.0 cm are placed d = 50.0 cm apart, as shown in Figure P23.44. The final image is to be located between the lenses, at the position x = 31.0 cm indicated. (a) How far to the left of the first lens should the object be positioned? (b) What is the overall magnification of the system? (c) Is the final image uptight or inserted? Figure P23.44(a) What is the maximum angular magnification of an eyeglass lens having a focal length of 18.0 cm when used as a simple magnifier? (b) What is the magnification of this lens when the eye is relaxed?A camera with a 50.0-mm focal length lens is being used to photograph a person standing 3.00 m away. (a) How far from the lens must the film be? (b) If the film is 36.0 mm high, what fraction of a 1.75-m-tall person will fit on it? (c) Discuss how reasonable this seems, based on your experience in taking or posing for photographs.
- A converging lens made of crown glass has a focal length of 15.0 cm when used in air. If the lens is immersed in water, what is its focal length? (a) negative (b) less than 15.0 cm (c) equal to 15.0 cm (d) greater than 15.0 cm (e) none of those answersSuppose you have a 0.750 D prescription for contact lenses.a. What’s your near point? b. What would your prescription be, in diopters, for glasses worn 2.20 cm from the eyes?A. A man with myopia has a far point of 20cm. What power contact lens will correct his vision? B. Repeat the same problem for glasses held 1.5cm from his eyes.
- Suppose we model the cornea of the human eye as a thin lens with a focal length of 2.00 cm. We also assume the material to have a refractive index of 1.38. If its front surface has a radius of curvature of +5.00 mm, what is the radius of curvature of the backside of the cornea?A. –6.16 mmB. –0.90 mmC. +3.02 mmD. +14.6 mmPresbyopia is the tendency to gradually become far-sighted (hyperopic) as you age. If you have normal vision when you are young, you have a near point of 25 cm.A. If the distance between your eye's lens and retina is 1.73 cm, what is the focal length of your eye's lens when you look at an object at your near point?f = _____ cmB. As you get older, suppose that the near point of your eye increases to 46 cm. What is the focal length of your eye's lens when you look at an object at your near point now?f = _______ cmC. With your near point at 46 cm, what is the focal length of the corrective lens (placed directly in front of your eye's lens) which you would need to look at an object that is 25 cm in front of your eye?f = _____ cmA biconvex lens is made of glass of refractive index 1.50. The radii of curvature of the surfaces are 25.0 cm and 10.0 cm. a. What is the focal length of the lens? What is the focal length of the lens when placed in water of refractive index 1.33?
- A person with a cataract had his original lens removed and replaced with an implant. The fixed lens implant sharply focuses objects 2m away. Assume the patent is to be fitted with a lens that is 2 cm in front of his eye. A. What focal length will allow him to see distant objects clearly? B. What focal length will Allow him to watch TV at 3M distance? C. What focal length will allow him to read the newspaper at 20 cm from his eyes? D. What is the power of the lens in C in diopters?Presbyopia is the tendency to gradually become far-sighted (hyperopic) as you age. If you have normal vision when you are young, you have a near point of 25 cm.A. If the distance between your eye's lens and retina is 1.67 cm, what is the focal length of your eye's lens when you look at an object at your near point?f = _______ cmB. As you get older, suppose that the near point of your eye increases to 48 cm. What is the focal length of your eye's lens when you look at an object at your near point now?f = ________ cmC. With your near point at 48 cm, what is the focal length of the corrective lens (placed directly in front of your eye's lens) which you would need to look at an object that is 25 cm in front of your eye?f = ________ cmD. As you continue to age, the corrective lenses will no longer be sufficient to allow you to see an object that is 25 cm in front of your eye. When you are wearing your corrective lenses, suppose that you can now see objects only if they are no closer than 42…answer c and d pls!