Question

The near point of a patient's eye is 54.2 cm. (a) What should be the refractive...

The near point of a patient's eye is 54.2 cm.

(a) What should be the refractive power ℛ of a corrective lens prescribed to enable the patient to clearly see an object at 23.0 cm?
ℛ =  dpt

(b) When using the new corrective glasses, the patient can see an object clearly at 26.8 cm but not at 23.0 cm. By how many diopters did the lens grinder miss the prescription?
? = dpt

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A patient's far point is 135 cm and her near point is 15.0 cm. In what...
A patient's far point is 135 cm and her near point is 15.0 cm. In what follows, we assume that we can model the eye as a simple camera, with a single thin lens forming a real image upon the retina. We also assume that the patient's eyes are identical, with each retina lying 1.95 cm from the eye's "thin lens." (a) What is the power, P, of the eye when focused upon the far point? (Enter your answer in...
2. Correcting vision: quantitative. Corrective lenses work because the lens bends light such that it, combined...
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...
(a) Where is the near point of an eye for which a contact lens with a...
(a) Where is the near point of an eye for which a contact lens with a power of +2.95 diopters is prescribed? cm (in front of the eye) (b) Where is the far point of an eye for which a contact lens with a power of -1.35 diopters is prescribed for distant vision? cm (in front of the eye)
A. Where is the near point of an eye for which a contact lens with a...
A. Where is the near point of an eye for which a contact lens with a power of +2.85 diopters is prescribed? B. Where is the far point of an eye for which a contact lens with a power of –1.10 diopters is prescribed for distant vision?
7. Assume that a person's lenses have a refractive power of 2.75 diopters that allow the...
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...
The far point of an eye is 185 cm. A corrective lens is to be used...
The far point of an eye is 185 cm. A corrective lens is to be used to allow this eye to focus clearly on objects a great distance away. What should be the focal length of this lens? What is the power of the needed corrective lens in diopters?
You are designing eye glasses got someone whose neR point is 100 cm. A) neglecting the...
You are designing eye glasses got someone whose neR point is 100 cm. A) neglecting the eye lens distance, what focal length lens should you prescribe so that an object can clearly be seen when placed at 25 cm in front of the eye? (Hint =25 cm and q= -100 cm) B) what is the lens power in diopters?
1. A person has refractive hypermetropia with a near point at 3 m. They are to...
1. A person has refractive hypermetropia with a near point at 3 m. They are to be prescribed a set of glasses that will enable them to have normal close-in vision and the person’s glasses will typically sit 2 cm in front of their eyes. (a) What is the maximum optical power of this person’s eyes? (b) What is the optical power of the glasses required?
What power of spectacle lens is needed to allow a farsighted person, whose near point is...
What power of spectacle lens is needed to allow a farsighted person, whose near point is 2.50 m, to see an object clearly that is 20.0 cm away? Assume the spectacle (corrective) lens is held 2 cm away from the eye by eyeglass frames.
Suppose that a person's lenses have a refractive power of 2.75 diopters that allow the person...
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.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT