
3. What is the focal length of the corrective contact lens needed by a nearsighted person...
A person is nearsighted with a near point of 75. cm. (a) What FOCAL LENGTH is this? (b) What POWER lens is needed to correct their nearsightedness (assuming distance from lens to eye is negligible)?
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...
A nearsighted person receives a contact lens prescription that says -4.25 D. What is the person’s far point?
A near-sighted person has a far point of 80 cm. A) What kind of corrective lens the person will need if the lens is to be placed 1.5 cm from the eye? The answer is not 78.5, 80 or -1.27 B) What would be the power of the contact lens needed? Assume distance to contact lens from the eye to be zero.
What is the power of a contact lens for a nearsighted whose far point is 1.50m? Answer: D
A near sighted person wears corrective glasses made of a diverging lens with a focal length of f = −50 cm. The result is that far away objects appear much closer, and the person sees this image rather than the actual object. Suppose a 12 cm long pencil is held vertically at a distance of 2.0 m from the person. Determine the height and location of the formed image. (for trig-based physics class)
A nearsighted person has a near point of 14 cm and a far point of 40 cm. What power corrective lens is needed for her to have clear distant vision? With this corrective lens in place, what is her new near point?
For a normal eye, the focal length of the lens if f = 1.7 cm. If your friend is nearsighted such that the focal length of her lens is 2.0 cm. What should be the focal length of the corrective lens?
A person has a near point of 14 cm and a far point of 82 cm. Is the person nearsighted or farsighted? What focal length corrective lens will allow this person to read the whiteboard from the back of a large classroom? Are the corrective lenses converging or diverging? What is the power of the corrective lenses?
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...