The near and far points of a person are at 40 cm and 250 cm respectively. Find the power of the lens he/she should use while reading at 25 cm. With this lens on the eye, what maximum distance is clearly visible ?
Q: The contact lens prescription for a nearsighted person is –3.5 D, and the person has a far point of…
A: power of contact lens = –3.5 D far point of person = 24 cm
Q: A person is nearsighted with a far point of 75.0 cm. (a) What focal length contact lens is needed to…
A: The person is nearsighted with a far point, that is, Image distance is Note:Find:(a) Focal length of…
Q: A person sees clearly wearing eyeglasses that have a power of – 4.0 D when the lenses are 2.0 cm in…
A: a) we know that focal length f is given by f = 1/P= 1/-4=-25cm
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Q: A microscope has an objective lens of focal length +0.70-cm and an eyepiece of focal length +2.1-cm.…
A: Apply the lens formula for the objective lens and substitute the required values. Apply the lens…
Q: A 7.5x binocular produces an angular magnification of -7.50, acting like a telescope. (Mirrors are…
A: Given: The focal length of the objective lenses of the binocular is 75.0 cm. The magnification of…
Q: (a) Find the far point of an eye for which a prescribed lens has an optical power of -0.65 d. (b)…
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Q: The focal length of the lens of a simple digital camera is 40 mm, and it is originally focused on a…
A: Focal length f = 40 mm Distance apart d = 25 m As distance is reduce from 25 m to 4.0 m, image…
Q: ith focal length f = 30 cm is used to view an object 90 cm from the lens. How far from the lens does…
A: We know that the lens formula is given as 1f= 1u+1v where f is the focal length of the lens u is…
Q: A person’s left eye can see objects clearly only if they are between 30-cm and 80-cm away. What…
A: A person can see maximum upto 80 cm . So a person will need a concave lens with focal length =80cm…
Q: (a) Find the far point of an eye for which a prescribed lens has an optical power of -0.45 d. (b)…
A: A) power (P) = -0.45 D
Q: Question: What is the edge thickness of a -5.00 D biconcave glass lens (n = 1.523), f the center…
A: A concave lens is one that has at least one inwardly curving surface. It is a divergent lens, which…
Q: Find the far point of an eye for which a prescribed lens has an optical power of -0.58 d. (b) Find…
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Q: To fit a contact lens to a patient's eye, a keratometer can be used to measure the curvature of the…
A: The cornea of the eye behaves like a spherical mirror, reflecting off any light incident on it. When…
Q: (a) A 2.40-cm-high insect is 1.30 m from a 135-mmfocal-length lens. Where is the image, how high is…
A: Height of insect (h1)=2.4 cm Distance of insect from the lens (u)=-1.3 m=-130 cm
Q: What power of reading glasses is needed for a person whose near point is 125 cm so that they may…
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Q: A certain child’s near point is 10.0 cm; her far point (with eyes relaxed) is 125 cm. Each eye lens…
A: Given:Certain child's near point = 10 cmHer far point = 125 cmEach Eye lens is 2 cm from the retina
Q: I can't focus on a book that is at a comfortable distance of 25.0 cm from my eyes, so I hold it 42…
A: distance of lenses from eyes = 1.9 cm distance of book from eyes = 42 cm distance of book from lens…
Q: farsighted person cannot see objects closer to the eye than 75 cm. Determine the power of the…
A: Given : Image distance , v = 75 cm = 0.75m Object distance, u = 25 cm = 0.25m We will use the…
Q: Assume that the far point of a myopic (nearsighted) eye is 8.13 m in front of the eye. A lens is…
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Q: A camera is equipped with a lens with a focal length of 40.0 cm. When an object 2.50 m away is being…
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Q: A 72 year old woman has a near point of 88 cm. What power lens (in diopters) does the woman need in…
A: Object distance Image distance (Virtual image)Power
Q: A far-sighted person has a near point of 1.0 m. What prescription glasses are needed to correct her…
A: The spectacle lens must create a image 1.00 m (the near point) distant when an object is held 25.0…
Q: Frank can see fine at long distances but now needs to hold a restaurant menu at 50.0 cm from his…
A: u = -(50-1.5) = -48.5 cm v = -(25-1.5) = -23.5 cm
Q: The lens-to-retina distance of a woman is 2.04 cm, and the relaxed power of her eye is 53.8 D. (a)…
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Q: A certain camera lens has a focal length of 175 mm. Its position can be adjusted to produce images…
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- MCQs Determine where the position and size, a shadow of a large flower 7.6 cm high which is placed 1.00 m from the converging camera lens with a focal length of +50.0 mm A. The shadow is 52.6 mm and the image height is 4.0 mm B. The shadow is 34.6 mm and the image height is 2.4 mm C. The shadow is 32.6 mm and the image height is 4.2 mm D. The shadow is 54.6 mm and the image height is 2.4 mmThe focal length of the lens of a simple digital camera is 40 mm, and it is originallyfocused on a person 25 m away. In what direction must the lens be moved tochange the focus of the camera to a person 4.0 m away?When do (known as object distance) is very large, what does the thin lens equation predict for the value of 1/f? Similarly, when do (object distance) is very small or less, what does the thin lens equation predict for the value of 1/f?
- An object is in front of a converging lens (f = 0.35 m). The magnification of the lens is m = 2.5. (a) Relative to the lens, in what direction should the object be moved so that the magnification changes to m = -2.5? (b) Through what distance should the object be moved? (a) (b) Number i eTextbook and Media Save for Later Attempts: 0 of 5 used Units Submit AnswerProblem 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?Your camera’s zoom lens has an adjustable focal length ranging from 55 to 150 mm. Part (a) What is the maximum power of the lens, Pmax, in diopters? Part (b) What is the minimum power of the lens, Pmin, in diopters?
- An object and an image screen are separated by 50 cm. There are two locations betweenthem where a thin lens with f = 8 cm can be placed so that a focused image forms on thescreen. Find the two positions.What would be the image distance for the +20.0 cm lens if the object distance were +60.0 cm? What would be the corresponding magnification of the image? Would the image be upright or inverted?