College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- A boy with myopia has an abnormal far point of 80.0 cm. What power of corrective lens is needed to accurately adjust his vision? Neglect the distance between the eye and the corrective lens. a. -2.00 D b. -1.25 D C. -1.75 D d. -1.50 D e. -2.25 Darrow_forwardA 72 year old woman has a near point of 88 cm. What power lens (in diopters) does the woman need in order to be able to see an object clearly at the normal near point of 25 cm? Assume that the woman will get contact lenses, that is neglect the two centimeters that glasses would be away from the eye. 3805 This is an example of farsightedness. The correcting lens (converging in this case) has to move the (virtual) Image of an object placed at the normal near point (o) to the actual near point d the worhan (1). Then you can calculate the focal length of the lens. Remember that the image is virtual. Sub A Incorrect. Tries 1/99 Previous Tries Post Discussion Send Feedbarrow_forwardA prescription for reading glasses has a power of P = 2.42 D. What is the focal length of the lenses? (Units: cm)arrow_forward
- An object is 19 cm in front of a diverging lens that has a focal length of -13 cm. How far in front of the lens should the object be placed so that the size of its image is reduced by a factor of 2.3? Number -18.98 Units cmarrow_forward10.arrow_forwardA farsighted eye is corrected by placing a converging lens in front of the eye. The lens will create a virtual image that is located at the near point (the closest an object can be and still be in focus) of the viewer when the object is held at a comfortable distance, usually taken to be 25.0 cm.25.0 cm. If a person has a near point of 49.5 cm,49.5 cm, what power reading glasses should be prescribed to treat this hyperopia? Assume that the distance from the eye to the lens is negligiblearrow_forward
- Buttercup is using a compound microscope with an objective lens focal length of 6.2mm and a tube length of 18.2cm. She rotates the knob to adjust the vertical position of the specimen plateform until she gets the image in focus. What is the distance between the slide and the objective lens in millimeters at this point? 188.2 mmarrow_forwardA farsighted person has a near-point of 92 cm. To correct their vision so that they can see objects that are as close as 10 cm to their eye, what should be the focal length of the prescribed lens? Assume the lens will be 2 cm from the eye. Enter a number with units.arrow_forwardAn eyeglass prescription that specifies a power of -1.0 diopters is describing a lens that has a focal length of O a. + 1 meter O b.- 100 cm O C. - 1 meter O d. - 1 cm An object placed 25 cm to the left of a +20 cm focal length lens produces a real image 100 cm to the right of the lens. What is the magnification? O a. - 4 Ob. - 0.25 O C. + 2 O d. - 1arrow_forward
- An individual is nearsighted; his near point is 11.0 cm and his far point is 59.0 cm. (a) What lens power is needed to correct his nearsightedness?_____ diopters(b) When the lenses are in use, what is this person's near point?______ cmarrow_forwardWhich of the following statements is true about an eye that is farsighted? Question 17 options: The image is in front of the retina, and this can be corrected by a converging lens. The image is in back of the retina, and this can be corrected by a converging lens.arrow_forwardWhat is the power ? of the eye when viewing an object 41.0 cm away? Assume the lens-to-retina distance is 2.00 cm , and express the answer in diopters. Power???arrow_forward
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