The near point of a person's eye is 56.0cm. (Neglect the distance from the lens to the eye.)
(a) To see objects clearly at a distance of 26.0cm, what should be the focal length of the appropriate corrective lens?
cm
(b) To see objects clearly at a distance of 26.0cm, what should be
the power of the appropriate corrective lens?
diopters
The near point of a person's eye is 56.0cm. (Neglect the distance from the lens to...
The near point of an eye is 111 cm. A corrective lens is to be used to allow this eye to focus clearly on objects 25.0 cm in front of it. What should be the focal length of this lens? What is the power of the needed corrective lens (in diopters)? Do not enter units.
Goal Apply geometric optics to correct nearsightedness. Problem A particular nearsighted patient can't see objects clearly when they are beyond 24 cm (the far point of the eye). (a) What focal length should the prescribed contact lens have to correct this problem? (b) Find the power of the lens, in diopters. Neglect the distance between the eye and the corrective lens. Strategy The purpose of the lens in this instance is to take objects at infinity and create an image...
Without corrective lenses, a person's far point is 17.2cm and the power of their relaxed eye is 51.2 D. A lens is placed 1.85cm away from the eye. What power will the lens be to allow them to see objects at a distance? Can you explain why the relaxed eye has a power of +51.2? When they are nearsighted shouldn't diopters be negative??
The near point of a patient's eye is 44.2 cm. (a) What should be the refractive power ℛ of a corrective lens prescribed to enable the patient to clearly see an object at 21.0 cm? ℛ = dpt (b) When using the new corrective glasses, the patient can see an object clearly at 24.4 cm but not at 21.0 cm. By how many diopters did the lens grinder miss the prescription? dpt
A particular nearsighted patient can't see objects clearly beyond 19.7 cm from their eye. Determine the lens power required to correct the patient's vision and the type of lens required (converging or diverging). Neglect the distance between the eye and the corrective lens. HINT (a) the lens power required to correct the patient's vision (in diopters) diopters (b) the type of lens required (converging or diverging) O converging Odiverging
For a normal eye, the near point is 25.0 cm. This is where you would like to place the printed material such as the newspaper to read. The far point is very far away. What type and focal length corrective contact lens should a nearsighted person whose far point is 80.0 cm wear? What is the power of this lens? What type and focal length corrective contact lens should a farsighted person wear if the persons near point is 60.0...
The lens-to-retina distance of a woman is 1.92 cm, and the relaxed power of her eye is 54.6 D. (a) What is her far point? How is the refracting power of a person's eye for distant vision related to their far point and lens-to-retina distance? m (b) What eyeglass power will allow her to see distant objects clearly, if her glasses are 1.80 cm from her eyes?
With a near point of 15.0 cm, a nearsighted professor can focus on relatively nearby objects. Yet, with a far point 62.0 cm out, he cannot clearly see distant objects without optical ald. (a) Calculate the focal length (in cm) of a contact lens that would enable this professor to clearly view very distant objects. (Hint: Allow p to approach Infinity in the thin-lens equation). (b) What power (in diopters) describes this contact lens? diopters (c) When this contact lens...
Suppose a lens is placed in a device that determines its power as 2.92 diopters. (a) Find the focal length of the lens. f = cm (b) Find the minimum distance at which a patient will be able to focus on an object if the patient's near point is 31.5 cm. Neglect the eye-lens distance. dmin = cm
A person's right eye can see objects clearly only if they are between 25 cm and 87 cm away. What power of contact lens is required so that objects far away are sharp? What will be the near point with the lens in place?