Question

The uncorrected eye. For the following questions, assume that the distance between the eye lens and...

The uncorrected eye. For the following questions, assume that the distance between the eye lens and the retina is 1.70 cm. In other words, since the image is always formed on the retina, the distance between the lens and the image is always 1.70 cm. Also note that, as is seen in the ray diagram, since the eye lens is converging and the image is on the opposite side of the lens compared to the object, the image is always real.

a. What is the focal length of the eye when an object is 25.0 cm away from the eye lens? \

b. What is the focal length of the eye when an object is very far away from the eye lens (object at infinity)?

c. One nearsighted patient has a far point of 400 cm. What is the focal length of her eye when an object is at her far point? How does this focal length compare to the focal length in part b?

d. One farsighted patient has a near point of 40.0 cm. What is the focal length of his eye when an object is at his near point? How does this focal length compare to the focal length in part a?

e. The nearsighted patient in part c tries to view an object that is very far away (object at infinity). Use the focal length calculated in part c to determine the location of the image. How does this compare to the distance from the eye lens to the retina? What kind of image is seen on the retina?

f. The farsighted patient in part d tries to view an object 25 cm away from his eye, which a person with normal vision can see clearly. Use the focal length calculated in part d to determine the location of the image. How does this compare to the distance from the eye lens to the retina? What kind of image is seen on the retina?

Science   Advanced-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
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...
1) The distance from the lens to the retina is 3.1 cm, what is the effective...
1) The distance from the lens to the retina is 3.1 cm, what is the effective focal length of the lens when staring at an object infinitely far away? 2) An object is moved to 40cm from the eye. What must the focal length of the eye be to focus the image on the retina? 3) In the near sighted eye, images focus before hitting the retina. Suppose the focal length of the lens is 1.9 cm, while the distance...
Contact lenses are placed right on the eyeball, so the distance from the eye to an...
Contact lenses are placed right on the eyeball, so the distance from the eye to an object (or image) is the same as the distance from the lens to that object (or image). A certain person can see distant objects well, but his near point is 50.0 cm from his eyes instead of the usual 25.0 cm . Part A Is this person nearsighted or farsighted? Is this person nearsighted or farsighted? This person is nearsighted. This person is farsighted....
A. The human eye 1. Whenever a normal eye forms an image, the image distance will...
A. The human eye 1. Whenever a normal eye forms an image, the image distance will always equal the distance from the cornea and eye lens to the retina (~25 mm), regardless of how far away the object is located. Explain why the image distance cannot change. 2. If the image distance must change, then what intrinsic property of the eye lens must change in order for the eye to focus on objects at different distances? Hint: read the Introduction....
A person is farsighted and has near point of 50 cm. Retina is at a distance...
A person is farsighted and has near point of 50 cm. Retina is at a distance L = 1.7 cm. When wearing contact lenses and reading a book 30 cm in front of the eye, what is the object distance for the lenses? What is the desired image distance? Is the magnitude of the image distance a minimum, maximum, or the only acceptable image distance? Find the focal length and refractive power of the contact lens that will fix this...
1. What is the optical power of the eye when viewing an object from a distance...
1. What is the optical power of the eye when viewing an object from a distance of 23.5 cm?                                           2.What is the far point for a person whose eyes have a relaxed power of 50.25 D? 3. What power lens is required to correct a myopic (nearsighted) eye with a far point of 6.50 m? Neglect the distance between the corrective lens and the eye. 4. What power lens is required to correct a hyperopic (farsighted) eye with a...
1. Consider a 1 mm bug located at your nearpoint, 25 cm away from your left...
1. Consider a 1 mm bug located at your nearpoint, 25 cm away from your left eye. 1a). Sketch the object, lens and image positions if the object is 1 mm in size and the image distance between the retina and lens in your eye is 1 cm. 1b). What focal length for your eye lens is needed to focus the bug’s image onto your retina? 1c). If you insert a convex magnifying glass 6 cm away from the bug,...
Q2. Lenses and the Eye An object O is positioned 3.5 m from a lens of...
Q2. Lenses and the Eye An object O is positioned 3.5 m from a lens of focal length f = -1.5 m as shown: Copy the diagram and draw in: the path of a parallel ray from the top of the object through the lens; the path of a ray through the centre of the lens; and hence the location of the image. Calculate the image distance di from the lens. Mark this distance on the diagram in a). A...
A patient can't see objects closer than 32.0 cm and wishes to clearly see objects that...
A patient can't see objects closer than 32.0 cm and wishes to clearly see objects that are 20.0 cm from his eye. (a) Is the patient nearsighted or farsighted? nearsighted farsighted     (b) If the eye–lens distance is 1.96 cm, what is the minimum object distance p from the lens? (Give your answer to at least three significant digits.) cm (c) What image position with respect to the lens will allow the patient to see the object? (Give your answer to...
A farsighted eye is corrected by placing a converging lens in front of the eye. The...
A farsighted eye is corrected by placing a converging lens in front of the eye. The lens will create a virtual image that is located at the near point (the closest an object can be and still be in focus) of the viewer when the object is held at a comfortable distance, usually taken to be 25.0 cm.25.0 cm. If a person has a near point of 49.5 cm,49.5 cm, what power reading glasses should be prescribed to treat this...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT