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- You can buy a pair of reading glasses at the pharmacy with a +1.75 diopter...
an older person needs a pair of reading glasses.Her near point is at 48 cm from...
an older person needs a pair of reading glasses.Her near point is at 48 cm from her eyes and reading glasses are 2 cm from her eyes. The glasses should allow her to read 25 cm away. What are the object and image distances? what is the magnification of these lenses? What is the focal length of the pair of glasses? What is the optical power of the lens pair? What type of lenses (converging, diverging) does she need?
A pair of glasses is designed for a person with a far-point distance of 2.5 m...
A pair of glasses is designed for a person with a far-point distance of 2.5 m so that she can read street signs 29.5 m away. (The far-point distance is the distance from the eye at which you are just able to properly focus a distant object.) (a) If the glasses are to be worn 1.0 cm from her eyes, what is the needed focal length? (b) Compare this focal length (find the percent difference) to the focal length she...
A pair of glasses is designed for a person with a far-point distance of 2.5 m...
A pair of glasses is designed for a person with a far-point distance of 2.5 m so that she can read street signs 29.5 m away. (The far-point distance is the distance from the eye at which you are just able to properly focus a distant object.) (a) If the glasses are to be worn 1.0 cm from her eyes, what is the needed focal length? (b) Compare this focal length (find the percent difference) to the focal length she...
Part A: Investigation of lens behaviors using a distant object Go to a room that has...
Part A: Investigation of lens behaviors using a distant object Go to a room that has an outside window. With only the windows cracked open and all other lights off, use the reading glasses (or, more easily, the magnifying glass) and see if you can capture the light of something outside the window (perhaps a tree, or a light post or anything you can see outside the window) and “project” the captured light on to a screen (this screen can...
please help with part 2 A pair of glasses is designed for a person with a...
please help with part 2
A pair of glasses is designed for a person with a far-point distance of 5 m so that she can read street signs 32.5 m away. (The far-point distance is the distance from the eye at which you are just able to properly focus a distant object.) (a) If the glasses are to be worn 1.0 cm from her eyes, what is the needed focal length? -5.90 m You are correct. Your receipt no. is...
a) You can make a hole on a paper with sunlight using mom's 2.25 D reading...
a) You can make a hole on a paper with sunlight using mom's 2.25 D reading glasses. What is the focal length of those reading glasses?. b) What is the index of refraction of a substance that has a critical angle of 69° when immersed in water ? Note that the refractive index of water is 1.33.
Asap Question 24 of 31 > You have a lens whose focal length is -5.87 cm....
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Question 24 of 31 > You have a lens whose focal length is -5.87 cm. You place an object on the axis of the lens at a distance of 12.3 cm from it. How far is the object's image from the lens? Enter the answer as a positive quantity image distance: cm If it can be determined, is the image real or virtual? Oreal cannot be determined < Question 22 of 31 What is the focal length of 2.4...
Please make sure you use the correct amount of significant figures in the anser. Your grandfather's...
Please make sure you use the correct amount of significant
figures in the anser.
Your grandfather's left eye is presbyopic. This eye can clearly see only beyond a distance of 89 cm, which makes it difficult for him to read the newspaper. If the printed text in his newspaper averages 3.5 mm in height, how high is the image of the text on his retina if he holds the newspaper as close to his eye as he can? Assume the...
please I need answers to all questions because am writing text on Friday. 7. Suppose an...
please I need answers to all questions because am
writing text on Friday.
7. Suppose an object such as a book page is held 7.50 cm from a concave lens of focal length -1C em. Such a lens could be used in eyeglasses to correct pronounced nearsightedness. (a) Using the thin le equations to calculate the location of the image. (b) What magnification is produced? (c) Use ray tracing get an approximate location for the image. 8. The left face...
This is a two part question. Part 1. To look closely at a small object, such...
This is a two part question. Part 1. To look closely at a small object, such as an insect or a crystal, you bring it close to your eye, making the subtended angle and the retinal image as large as possible. But your eye cannot focus sharply on objects that are closer than the near point, so the angular size of an object is greatest when it is placed at the near point (25 cm away from a “normal” eye)....
please help with part 2
A pair of glasses is designed for a person with a far-point distance of 5 m so that she can read street signs 32.5 m away. (The far-point distance is the distance from the eye at which you are just able to properly focus a distant object.) (a) If the glasses are to be worn 1.0 cm from her eyes, what is the needed focal length? -5.90 m You are correct. Your receipt no. is...
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Question 24 of 31 > You have a lens whose focal length is -5.87 cm. You place an object on the axis of the lens at a distance of 12.3 cm from it. How far is the object's image from the lens? Enter the answer as a positive quantity image distance: cm If it can be determined, is the image real or virtual? Oreal cannot be determined < Question 22 of 31 What is the focal length of 2.4...
Please make sure you use the correct amount of significant
figures in the anser.
Your grandfather's left eye is presbyopic. This eye can clearly see only beyond a distance of 89 cm, which makes it difficult for him to read the newspaper. If the printed text in his newspaper averages 3.5 mm in height, how high is the image of the text on his retina if he holds the newspaper as close to his eye as he can? Assume the...
please I need answers to all questions because am
writing text on Friday.
7. Suppose an object such as a book page is held 7.50 cm from a concave lens of focal length -1C em. Such a lens could be used in eyeglasses to correct pronounced nearsightedness. (a) Using the thin le equations to calculate the location of the image. (b) What magnification is produced? (c) Use ray tracing get an approximate location for the image. 8. The left face...
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