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

Q: People who do very detailed work close up, such as jewellers, often can see objects clearly at much…

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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: Suppose the accommodation limits for a nearsighted woman’s eyes are 20.0 cm and 90.0 cm. When…

A: Given data The object distance is given as p=∞.  The image distance is given as q = -90 cm. The…

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: What power of spectacle lens is needed to allow a farsighted person, whose near point is 2.50 m, to…

A: The image distance is The image is on the same side of the eye glass lens as the object and hence…

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: Unless otherwise stated, the lens-to-retina distance is 2.00 cm. A 7.5 X binocular produces an…

A: Magnifying power of binocular is given by: M = fo/ue given data suggests : fo = 75 cm and M = 7.5…

Q: An object of height 15.8 cm is placed 16.3 cm from a diverging lens. What is the angular size of…

A: The height of the object is h=15.8 cm. The distance of the object is di=16.3 cm.   Angular size of…

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: The contact lens prescription for a nearsighted person is -4.00 D and the person has a far point of…

A: The expression for the power of the lens is, P=1di+1do             (I)                 di=image…

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 nearsighted person has a far point of 66 cm. Determine the power of the contact lens they need.…

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Q: In a compound microscope, it consists of an objective lens with a focal length of 5 mm and an…

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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: To fit a contact lens to a patient’s eye, a keratometer can be used to measure the curvature of the…

A: Consider an object is placed at a distance p from the cornea and the image formed at a distance q.…

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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Q: (a) Find the far point of an eye for which a prescribed lens has an optical power of -0.52 d. (b)…

A: (a) far point of eye is = 1/D                       = 1/0.52                      = 1.92 m B )/…