For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20 D. using this information the distance between the retina and the cornea-eye lens can be estimated to be?

Q: The ciliary muscles in a horse’s eye can make only small changes to the shape of the lens, so a…

A: Concept: Similar to circle sphere is a two dimensional space where the set of points that are at the…

Q: A person is to be fitted with bifocals. She can see clearly when the object is between 32 cm and 2.1…

A: Given Data The image distance for lower  is:v=32cm The image distance for upper is:v=2.1 m The…

Q: An air-gap parallel-plate capacitor has a plate area of 2 cm2 and a separation of 3 mm is charged to…

A: Given, Area, A= 2×10-4m2 Separation, d = 3×10-3m ε=8.854×10-12 V= 2V The capacitor for plate, C=εAd…

Q: A person has a defect eye with a clear vision at distances from his eye from 0.15m to 0.80m.…

A: The distant object examination means the object is at infinity Therefore the distance would be…

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

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Q: An optometrist has a patient who needs bifocals. The patient can clearly see an object when it is…

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Q: A convex lens of power +4 D and a concave lens of power 3 D are placed in contact. What is…

A: Given that:Power of convex lens, P1=+4 DPower of concave lens, P2=3 D

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) What power contact lens is needed to correct the vision of a person who has a near point of 55.0…

A: (a) What power contact lens is needed to correct the vision of a person who has a near point of 55.0…

Q: A

A: Near point=13.5 cm=13.5/100=0.135 m Far point=117 cm=117/100=1.17 m

Q: An optometrist has a patient who needs bifocals. The patient can clearly see an object when it is…

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Q: A particular farsighted person's eye can normally focus on an object at 80 cm. This person wants to…

A: Given data The farsight of the person is given as F = 80 cm. The distance between the corrective…

Q: A person has far and near points of 84 cm and 15 cm, respectively. What is the percent change in the…

A: Given : far point of eye of person, u1 = - 84 cm = 0.84 m ( distance of far object)            near…

Q: (a) what power contact lens is needed to correct the vision of a person who has a near point of 72.0…

A: Given, Di=72cm Do=25cm

Q: A certain child's near point is 13.0 cm; her far point (with eyes relaxed) is 115 cm. Each eye lens…

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Q: If the lens-to-retina distance of a woman is 1.98 cm, and the relaxed power of her eye is 51.0 D...…

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Q: Using the standard reduced eye model with a 17 mm distance from the nodal point to the retina,…

A: Given:- ho = 20 cm object distance = u = 3 m

Q: A 50-year-old man has good distance vision, but his near point is 50 cm. To bring this to a more…

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Q: that IS in of the retina. (a) With the +20 lens in your "eye" (in the water) and the light source 33…

A: The higher the focus of eye the former the image will be formed from the retina and hence image will…

Q: A cataract - impaired lens in an eye may be surgically removed and replaced by a manufactured lens.…

A: a). When P tends to infinity, the image distnace is equal to the focal length q=f

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: A person is nearsighted with a far point of 5 m. Spectacles that enable them to see distant objects…

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Q: n a LASIK vision correction, the power of a patient's eye is increased by 2.72 D. Assuming this…

A: Given  Increase in power =2.72 D Power Pnew =54 D Lens to retina distance v=0.02 m

Q: (a) Suppose Willebrord Snell's near point of vision is 55cm from his unaided eye. What power, in…

A: We will use the thin lens formula, 1v-1u  = 1f

Q: A person is to be fitted with bifocals. She can see clearly when the object is between 32 cm and 2.1…

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Q: Problem 3:  Your camera’s zoom lens has an adjustable focal length ranging from 75 to 150 mm.  Part…

A: Given data:  The range of focal length from 75 mm to 150 mm Required: The maximum and minimum power

Q: (a) What power contact lens is needed to correct the vision of a person who has a near point of 76.0…

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Q: The lens-to-retina distance of a woman is 1.94 cm, and the relaxed power of her eye is 54.0 D. (a)…

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Q: :  Assume the lens-to-retina distance of the human eye is 2.00 cm. Calculate the power P, in…

A: Given: The distance between lens and retina is 2 cm. The distance of the object is 4.5 m =450 cm…

Q: A candle (ho = 0.34 m) is placed to the left of a diverging lens (f = -0.051 m). The candle is do =…

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Q: Assume that the anterior radius, posterior radius, and thickness of the lens are 9.4 mm, -5.6 mm,…

A: Consider a lens (convex) of refractive index nl is placed in the medium (inside aqueous and vitreous…

Q: (a) Find an equation for the length L of a refracting telescope in terms of the focal length of the…

A: Part (a): The equation for the telescope’s length is, Here, f0 is the focal length of the objective…