A person can focus clearly only on objects between 33.5 cm and 51.5 cm from his...
A person can focus clearly only on objects between 33.5 cm and 51.5 cm from his eyes.
- Find the focal lengths of the correcting contact lenses needed to correct his closeup vision and distant vision.
- Find the powers of the correcting contact lenses needed to correct his closeup vision and distant vision. Answer in the order indicated. Separate your answers with a comma.
You want to view an insect 2.20 mm in length through a magnifier. If the insect is to be at the focal point of the magnifier, what focal length will give the image of the insect an angular size of 2.90×10−2 rad radians?
A thin lens with a focal length of 6.50 cm is used as a simple magnifier.
- What angular magnification is obtainable with the lens if the object is at the focal point?
- When an object is examined through the lens, how close can it be brought to the lens? Assume that the image viewed by the eye is at infinity and that the lens is very close to the eye.
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A person can focus clearly only on objects between 33.5 cm and
51.5 cm from his...
Background information A person with normal vision can focus on objects as close as a few centimeters from the eye up...
Background information A person with normal vision can focus on objects as close as a few centimeters from the eye up to objects infinitely far away. There exist, however, certain conditions under which the range of vision is not so extended. For example, a nearsighted person cannot focus on objects farther than a certain point (the far point), while a farsighted person cannot focus on objects closer than a certain point (the near point). Note that even though the presence...
An optometrist tests a person and finds that without glasses, he needs to have his eyes...
An optometrist tests a person and finds that without glasses, he needs to have his eyes 15.0 cm from a book to read comfortably and can focus clearly only on distant objects up to 2.75 m away, but no farther. A typical normal eye should be able to focus on objects that are between 25.0 cm (the near point) and infinity (the far point) from the eye. (a) What type of correcting lenses does the person need: single focal length...
4)Aseverely nearsighted person needs corective lenses. In one eye, this person can focus on objects over...
4)Aseverely nearsighted person needs corective lenses. In one eye, this person can focus on objects over a range from as close as 15.8cm to as far away as 69.1cm. A) What strength (in diopters) contact lens would correct the vision in this eye? B) If instead of contact lenses, this person were to get glasses, the lenses of the glasses will sit a distance of 1.9 cm from the person's eye. What strength lens (in diopters) would be needed for...
A person can see clearly up close, but cannot focus on objects beyond 82.0cm . She opts for contact lenses to corre...
A person can see clearly up close, but cannot focus on objects beyond 82.0cm . She opts for contact lenses to correct her vision. Part A Is she nearsighted or farsighted? Part B What type of lens (converging or diverging) is needed to correct her vision? Part C What focal-length contact lens is needed ?
Problem 25.25 - Enhanced - with Solution 19 of 21 A Review Constants Submit Previous Answers...
Problem 25.25 - Enhanced - with Solution 19 of 21 A Review Constants Submit Previous Answers A thin lens with a focal length of 6.15 cm is used as a simple magnifier. For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of A simple magnifier. Correct Set Up: When the object is at the focal point the image is at infinity and M= 25.0 cm Solve: M 25.0 cm 6.15cm 4.07x Part B When...
With a near point of 12.0 cm, a nearsighted technician can focus on relatively nearby objects....
With a near point of 12.0 cm, a nearsighted technician can focus on relatively nearby objects. Yet, with a far point 58.0 cm out, he cannot clearly see distant objects without optical aid. (a) Calculate the focal length (in cm) of a contact lens that would enable this technician to clearly view very distant objects. (Hint: Allow p to approach infinity in the thin-lens equation). (b) What power (in diopters) describes this contact lens? (c) When this contact lens is...
With a near point of 15.0 cm, a nearsighted professor can focus on relatively nearby objects....
With a near point of 15.0 cm, a nearsighted professor can focus on relatively nearby objects. Yet, with a far point 62.0 cm out, he cannot clearly see distant objects without optical ald. (a) Calculate the focal length (in cm) of a contact lens that would enable this professor to clearly view very distant objects. (Hint: Allow p to approach Infinity in the thin-lens equation). (b) What power (in diopters) describes this contact lens? diopters (c) When this contact lens...
Sometimes a person cannot clearly see objects close up or far away. To correct this type...
Sometimes a person cannot clearly see objects close up or far away. To correct this type of vision, bifocals are often used. The top half of the lens is used to view distant objects and the bottom half of the lens is used to view objects close to the eye. A person can clearly see objects only if they are located between 44 cm and 194 cm away from his eyes. Bifocal lenses are used to correct his vision. What...
13. Jayla observes a focused photograph (20.0 cm tall) at an object distance L-0.50m from her...
13. Jayla observes a focused photograph (20.0 cm tall) at an object distance L-0.50m from her eye. Note: the image distance for Jayla's eye (i.e. her eye diameter) is 2.45cm. Jayla's Eye Effective photo Retina Optical Axis 0.0245m i. The focal length of Jayla's relaxed eye is +0.0235m. What is Jayla's far point? i. Jayla purchases some contact lenses to correct her distance vision. Determine the optical power (to the nearest 0.25 diopters) and focal length needed to correct Jayla's...
Sometimes a person cannot clearly see objects close up or far away. To correct this type...
Sometimes a person cannot clearly see objects close up or far away. To correct this type of vision, bifocals are often used. The top half of the lens is used to view distant objects and the bottom half of the lens is used to view objects close to the eye. A person can clearly see objects only if they are located between 40 cm and 198 cm away from his eyes. Bifocal lenses are used to correct his vision. What...
4)Aseverely nearsighted person needs corective lenses. In one eye, this person can focus on objects over a range from as close as 15.8cm to as far away as 69.1cm. A) What strength (in diopters) contact lens would correct the vision in this eye? B) If instead of contact lenses, this person were to get glasses, the lenses of the glasses will sit a distance of 1.9 cm from the person's eye. What strength lens (in diopters) would be needed for...
Problem 25.25 - Enhanced - with Solution 19 of 21 A Review Constants Submit Previous Answers A thin lens with a focal length of 6.15 cm is used as a simple magnifier. For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of A simple magnifier. Correct Set Up: When the object is at the focal point the image is at infinity and M= 25.0 cm Solve: M 25.0 cm 6.15cm 4.07x Part B When...
With a near point of 15.0 cm, a nearsighted professor can focus on relatively nearby objects. Yet, with a far point 62.0 cm out, he cannot clearly see distant objects without optical ald. (a) Calculate the focal length (in cm) of a contact lens that would enable this professor to clearly view very distant objects. (Hint: Allow p to approach Infinity in the thin-lens equation). (b) What power (in diopters) describes this contact lens? diopters (c) When this contact lens...
13. Jayla observes a focused photograph (20.0 cm tall) at an object distance L-0.50m from her eye. Note: the image distance for Jayla's eye (i.e. her eye diameter) is 2.45cm. Jayla's Eye Effective photo Retina Optical Axis 0.0245m i. The focal length of Jayla's relaxed eye is +0.0235m. What is Jayla's far point? i. Jayla purchases some contact lenses to correct her distance vision. Determine the optical power (to the nearest 0.25 diopters) and focal length needed to correct Jayla's...
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