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Problem 14 An older person wears bifocals. The lower portion of the lens is converging and...
An older person wears bifocals. The lower portion of the lens is converging and has a focal length of 80 cm. The upper portion is diverging and has focal length of - 50 cm. What are near and far points of person’s unaided eye? Draw separate diagram for each lens label near and far points which ever is applicable. PLEASE DRAW THE 2 SEPARATE DIAGRAMS, ONE FOR EACH LENS, AND LABEL THE NEAR AND FAR POINTS. Problem 14 An older...
Problem 14 An older person wears bifocals. The lower portion of the lens is converging and has a focal length of 80 cm. The upper portion is diverging and has focal length of - 50 cm. What are near and far points of person's unaided eye? Draw separate diagram for each lens label near and far points which ever is applicable.
Problem 14 An older person wears bifocals. The lower portion of the lens is converging and has a focal length of 80 cm. The upper portion is diverging and has focal length of 50 cm. What are near and far points of person's unaided eye? Draw separate diagram for each lens label near and far points which ever is applicable.
One of the inevitable consequences of aging is a decrease in the flexibility of the lens. This leads to the farsighted condition called presbyopia (elder eye). Almost every aging human will experience it to some extent. However, for the myopic, or nearsighted, person it is possible that far vision will be limited by a subpar far point and near vision will be hampered by an expanding near point. One solution is to wear bifocal lenses that are diverging in the...
A near sighted person wears corrective glasses made of a diverging lens with a focal length of f = −50 cm. The result is that far away objects appear much closer, and the person sees this image rather than the actual object. Suppose a 12 cm long pencil is held vertically at a distance of 2.0 m from the person. Determine the height and location of the formed image. (for trig-based physics class)
In order to correct the vision of a farsighted person, a converging lens of focal length 33.8 cm is used to bring the person's near point in to the normal distance of 25 cm. Calculate the uncorrected near point of this farsighted person when eyeglasses are not used, in units of cm.
In order to correct the vision of a farsighted person, a converging lens of focal length 33.8 cm is used to bring the person's near point in to the normal distance of 25 cm. Calculate the uncorrected near point of this farsighted person when eyeglasses are not used, in units of cm.
A person has a near point of 14 cm and a far point of 82 cm. Is the person nearsighted or farsighted? What focal length corrective lens will allow this person to read the whiteboard from the back of a large classroom? Are the corrective lenses converging or diverging? What is the power of the corrective lenses?
A converging lens has 31.4 cm focal length, and is placed 21.0 cm behind a diverging lens. Parallel light strikes the diverging lens. After passing through the converging lens, the light is again parallel. What is the focal length of the diverging lens in cm? (Hint: draw a ray diagram)
A 4.0 cm tall object is 5.0 cm in front of a diverging lens with a focal length of -6.0 cm. A converging lens with a focal length of 6.0 cm is located 8.0 cm behind the diverging lens. (As viewed from the side, from left to right, the sequence is object - diverging lens - converging lens - observer. Rays then travel from left to right through the system.) (a) Use ray tracing to draw image 1 and image...