Question

7. Assume that a person's lenses have a refractive power of 2.75 diopters that allow the person to focus on an object that is 25 cm from the eye. The glasses are 25 cm from the eye. The glasses are 2.00 cm in front of the eyes. a) Is the near point of this person greater or less than 57.0 cm? What is the distance from the near point when the glasses have a refractive power of 2.53 diopters? Explain b) find the near point of this person.

Answer #1

The answer for above problem is explained below.

Suppose that a person's lenses have a refractive power of 2.75 diopters that allow the person to focus on an object that is 25 cm from the eye. The glasses are 2.00 cm in front of the eyes.
a) Is the close point of this person greater than or less than 57.0 cm? What is the distance from the near point when the glasses have a refractive power of 2.53 diopters? Explain b) find the close point of this person.

A person's prescription for his new bifocal eyeglasses calls for
a refractive power of -0.0600 diopters in the distance-vision part
and a power of 1.05 diopters in the close-vision part. Assuming the
glasses rest 2.00 cm from his eyes and that the corrected
near-point distance is 25.0 cm, determine the near and far points
of this person's uncorrected vision.

Contact lenses are placed on the eyeball, so the distance from
the eye to an object (or an image) is the same as the distance from
the lens to the object (or the image). If a person can see distant
objects well, but has a nearpoint of 53.0 cm instead of the usual
25.0 cm, what power of contact lenses are needed (in diopters)?
The same person now wants to wear glasses instead; they are 1.90
cm in front of...

Rachel wears glasses with -2.75 diopters power to
correct her myopia. The glasses are at a distance of 2.6 cm from
her eyes. If she does not wear her glasses what is her far
point?

7. A farsighted man uses contact lenses with a
refractive power of 1.95 diopters. Wearing the contacts, he is able
to read books held no closer than 0.255 m from his eyes. He would
like a prescription for eyeglasses to serve the same purpose. What
is the correct prescription for the eyeglasses if the distance from
the eyeglasses to his eyes is 0.025 m?
_________ diopters

A nearsighted man uses his ideally prescribed contact lenses
that have a refractive power of ?3.80 diopters. He would like a
prescription for eyeglasses. What is the correct eyeglasses
prescription if he wears his eyeglasses a distance of 2.20 cm from
his eyes?
in diopters

A nearsighted man uses his ideally prescribed contact lenses
that have a refractive power of ?2.20 diopters. He would like a
prescription for eyeglasses. What is the correct eyeglasses
prescription if he wears his eyeglasses a distance of 2.70 cm from
his eyes?

A farsighted man uses eyeglasses with a refractive power of 3.13
diopters. Wearing the glasses 0.023 m from his eyes, he is able to
read books held no closer than 0.260 m from his eyes. He would like
a prescription for contact lenses to serve the same purpose. What
is the correct contact lens prescription, in diopters?

A farsighted man uses eyeglasses with a refractive power of 3.01
diopters. Wearing the glasses 0.027 m from his eyes, he is able to
read books held no closer than 0.270 m from his eyes. He would like
a prescription for contact lenses to serve the same purpose. What
is the correct contact lens prescription, in diopters?

2. Correcting vision: quantitative. Corrective lenses work
because the lens bends light such that it, combined with the eye
itself, light forms a clear image on the retina. Another way to
think about this is that the corrective lens (glasses) form an
image of the object at a location where the eye can see clearly
without corrective lenses. For a nearsighted person viewing an
object very far away (object at infinity), the lens corrective lens
creates an image at the...

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