Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 32, Problem 64P
To determine
Person’s near point without lenses.
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A farsighted person has a near point that is 67.0 cm fromher eyes. She wears eyeglasses that are designed to enable herto read a newspaper held at a distance of 25.0 cm from her eyes. Find thefocal length of the eyeglasses, assuming that they are worn (a) 2.2 cmfrom the eyes and (b) 3.3 cm from the eyes.
A 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?
To determine the focal length f of a converging thin lens, youplace a 4.00-mm-tall object a distance s to the left of the lens and measurethe height h′ of the real image that is formed to the right of thelens. You repeat this process for several values of s that produce a realimage. After graphing your results as 1/h′ versus s, both in cm, you findthat they lie close to a straight line that has slope 0.208 cm^-2. What isthe focal length of the lens?
Chapter 32 Solutions
Physics for Scientists and Engineers
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- The contact-lens prescription for a nearsighted person is —4.00 D and the person has a far point of 22.5 cm. What is the power of the tear layer between the cornea and the lens if the correction is ideal, taking the tear layer into account?arrow_forwardThe contact lens prescription for a mildly farsighted person is 0.750 D, and the person has a near point of 29.0 cm. What is the power of the tear layer between the cornea and the lens if the correction is ideal, taking the tear layer into account?arrow_forwardThe disk of the Sun subtends an angle of 0.533 at the Earth. What are (a) the position and (b) the diameter of the solar image formed by a concave spherical mirror with a radius of curvature of magnitude 3.00 m?arrow_forward
- What is the angular magnification of a telescope that has a 100 cm local length objective and a 2.50 cm focal length eyepiece?arrow_forwardThe magnification of an upright image that is 34.0 cm away from its object is 0.400. What type of lens is used to form the image, and what is its focal length?arrow_forwardThe accommodation limits for a nearsighted persons eyes are 18.0 cm and 80.0 cm. When he wears his glasses, he can see faraway objects clearly. At what minimum distance is he able to see objects clearly?arrow_forward
- A myopic person sees that her contact lens prescription is —4.00 D. What is her far point?arrow_forwardShow that the magnification of a thin lens is given by M = di/do (Eq. 38.6). Hint: Follow the derivation of the lens makers equation (page 1233) and start with a thick lens.arrow_forwardIf the cornea is to be reshaped (this can be done surgically or with contact lenses) to correct myopia, should its curvature be made greater or smaller? Explain.arrow_forward
- A nearsighted person cannot see objects clearly beyond 25.0 cm (her far point). If she has no astigmatism and contact lenses are prescribed for her, what (a) power and (b) type of lens are required to correct her vision?arrow_forwardThe power for normal close vision is 54.0 D. In a vision-correction procedure, the power of a patient’s eye is increased by 3.00 D. Assuming that this produces normal close vision, what was the patient’s near point before the procedure?arrow_forward(a) Where does an object need to be placed relative to a microscope for its 0.500 cm focal leng1h objective to produce a magnification of 400? (b) Where should the 5.00 cm focal length eyepiece be placed to produce a further fourfold (4.00) magnification?arrow_forward
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