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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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One lens of a nearsighted person’s eyeglasses has a
focal length of -26.0 cm and the lens is 1.8 cm from the
eye. If the person switches to contact lenses placed directly
on the eye, what should be the focal length of the corresponding contact lens?
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- A converging lens of focal length 0.156 mforms a virtual image of an object. The imageappears to be 0.878 m from the lens on thesame side as the object.What is the distance between the objectand the lens?Answer in units of m.arrow_forwardA 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? dioptersarrow_forwardA large reflecting telescope has an objective mirror with a10.0 m radius of curvature. What angular magnificationdoes it produce when a 3.00 m focal length eyepiece isused?arrow_forward
- An individual is nearsighted; his near point is 17.0 cm and his far point is 49.0 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?arrow_forwardAn optometrist needs to prescribe corrective lenses for a person whose near point is q = 58.8 cm. If the patient is to see objects clearly at a distance of p = 25.0 cm, calculate the following. (Neglect the distance from the lens to the eye.) (a) focal length (in cm) of the appropriate corrective lens cm (b) power (in diopters) of the appropriate corrective lens dioptersarrow_forwardWhen the muscles connected to the crystalline lens relax, the focal length is 9.0000 cm. With this focal length, how close must an object be to form sharply focused images on the retina? (Note: this distance is called the near point of vision.)arrow_forward
- A compound microscope has a barrel whose length is 16.0 cmand an eyepiece whose focal length is 1.4 cm. The viewer has a near pointlocated 25 cm from his eyes. What focal length must the objective have sothat the angular magnifi cation of the microscope will be -320?arrow_forwardA compound microscope is made from an objective lens of focal length fo = 8 mm, andan eyepiece of fe = 12 mm. The objective lens is moved close to the object so that anintermediate image is formed 20 cm above the objective lens; then the eyepiece is set atits own focal length above the intermediate image, forming a virtual image at infinity forthe user’s eye. If the object is 0.15 mm in diameter, calculate the following, taking care todefine symbols used:i) The required distance of the objective lens above the object.ii) The diameter of the intermediate image.iii) The angular size of the image to the user’s eye.iv) The system angular magnification, defined as the angular size in (iii) divided by theangle subtended by the object to the naked eye from a distance of 25 cm.arrow_forwardA lens forms an image of an object5.00 cm from the lens on thesame side as the object. Theobject is located 20.0 cm from thelens. (a) What is the focal length of thelens? Is the lens converging ordiverging? (b) If the object is 2.00 cm tall, howtall is the image? Is it upright orinverted?arrow_forward
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