For a normal eye, the focal length of the lens if f = 1.7 cm. If...
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?
Homework Answers
1/f = 1/v + 1/u where f is the focal length of the lens, v is the image distance, and u is the object distance. Because the image is a virtual one, v is given a negative sign
1/f = 1/1.7-1/2
f = 11.33 cm
For a normal eye, the near point is 25.0 cm. This is where you would like...
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 near point of an eye is 100 cm. A corrective lens is to be used...
The near point of an eye is 100 cm. A corrective lens is to be used to allow this eye to clearly focus on objects 26.0 cm in front of it. (a) What should be the focal length of the lens? (b) What is the power of the needed corrective lens?
The focal length of the human eye is approximately 1.7 cm. What is the f-number for...
The focal length of the human eye is approximately 1.7 cm. What is the f-number for the human eye in bright light, when the pupil diameter is 3.0mm ? What is the f-number in dim light, when the pupil diameter has expanded to 7.0mm ?
The near point of an eye is 111 cm. A corrective lens is to be used...
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.
Problem 6. A fish's eye has a focal length of 1 cm in water (which is...
Problem 6. A fish's eye has a focal length of 1 cm in water (which is just the distance from the lens to the fish's retina, of course). Is its focal length in air longer or shorter? Don't just answer with a guess – you need to make a complete argument based on the lens-maker's formula or Snell's law directly, supported by pictures. Is the fish nearsighted or farsighted in air? Conversely, if you open your eyes underwater (and have...
Two lens with different focal length are made as a telescope. If the magnification is 16 and the length of telescope is 85 cm, how much is the focal length of eye lens?
Two lens with different focal length are made as a telescope. If the magnification is 16 and the length of telescope is 85 cm, how much is the focal length of eye lens?
3. What is the focal length of the corrective contact lens needed by a nearsighted person...
3. What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is 60 cm? a)-60 cm b)-30 cm c) +30 cm d) +60 cm e) +130 cm 4 An astronaut in trou
The near point of a person's eye is 56.0cm. (Neglect the distance from the lens to...
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
A person is nearsighted with a near point of 75. cm. (a) What FOCAL LENGTH is...
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)?
A person with normal eyesight uses a converging lens of focal length 10 cm. He holds...
A person with normal eyesight uses a converging lens of focal length 10 cm. He holds the lens close to his eye to finish an engraving job. At what distance from the job he must hold the lens? -Answer=7.1; why?
Problem 6. A fish's eye has a focal length of 1 cm in water (which is just the distance from the lens to the fish's retina, of course). Is its focal length in air longer or shorter? Don't just answer with a guess – you need to make a complete argument based on the lens-maker's formula or Snell's law directly, supported by pictures. Is the fish nearsighted or farsighted in air? Conversely, if you open your eyes underwater (and have...
3. What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is 60 cm? a)-60 cm b)-30 cm c) +30 cm d) +60 cm e) +130 cm 4 An astronaut in trou
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