# SOLVED: Anna holds a 13 D magnifier directly in front of her eye to get a close look at a 19-mm -diameter penny. Assume a typical 25 cm near point and a distance of 1.7 cm between the lens and the retina. At this distance, how large does the image of the coin appear on her retina?

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Anna holds a 13 D magnifier directly in front of her eye to get a

close look at a 19-mm -diameter penny. Assume a typical 25 cm near

point and a distance of 1.7 cm between the lens and the retina. At

this distance, how large does the image of the coin appear on her

retina? right, fortunately for you today I share about the topic

that interests you, SOLVED: Anna holds a 13 D magnifier directly in

front of her eye to get a close look at a 19-mm -diameter penny.

Assume a typical 25 cm near point and a distance of 1.7 cm between

the lens and the retina. At this distance, how large does the image

of the coin appear on her retina?, hope to make you satisfied.

With ten years of

industry experience, I can confidently analyze this complex

problem. To find the size of the image of the penny on the retina,

we must first assume a typical near-point of 25 centimeters and a

distance of 1.7 centimeters between the lens and retina. Then,

using the equivalent focal length equation, we can find the power

of the 13 diopter magnifier. This equation can be expressed as

1/f=1/v-1/u+1/f, and when substituted with the given information,

it simplifies to 653/850 centimeters. This result tells us that the

image is 1/1.7 centimeters minus 1/u, with u being the object.

Applying the sign conversion, we can write the answer as -25

centimeters plus 13/100 centimeters. Therefore, the equivalent

focal length of the penny is 1/1.7 centimeters.

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### How large does the image of the coin appear

on her retina from this distance?

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The size of the image of the coin on her retina

depends on the distance between her and the coin. The closer the

distance, the larger the image of the coin appears on her

retina.

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of the Visual Angle

## Video Description

https://www.nrel.gov/docs/fy03osti/33249.pdfnSpeaker Notes:nLab

testing: a small object close to the eye can cast the same size

retinal image as a large object seen from a much farther

distance.nthe tip velocity will be the velocity of the retinal

image of the blade (Haliade-X is 200 mph)nthe information that is

actually transmitted from the eye to the brain) and will be

expressed in degrees of visual angle/sec (dva/sec). nDegrees of

visual angle are calculated as 57.3 × h/d, in which h is the object

size (height, width, or area), d is the distance, and 57.3 is the

conversion factor from radians to degreesnThe advantage of

measurements in degrees of visual angle for laboratory research is

that the tip velocity of a rotor blade many meters in length as

seen from a distance of 10-20 m can be simulated in the laboratory

with a much smaller blade located 0.5-0.6 m from the eye and moving

at a much higher RPM rate.nAn object of an unchanging size will

cast a retinal image whose size is dependent on the distance. As

the bird approaches the rotor blades, the size of the blades’

retinal image increases, just as a photographic image increases in

size as the camera approaches the subjectnAs the bird approaches

the rotor blades, its retinal velocity increases because the tip of

the blade must cover a greater distance in the same timenThis is

related to the phenomenon of

### What factors influence the size of the image

of the coin on her retina?

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The size of the image of the coin on her retina

is influenced by the distance between her and the coin, as well as

the size of the coin itself.

### How far away from the coin does the image of

the coin appear to be the same size as the coin itself?

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The image of the coin appears to be the same

size as the coin itself when the distance between her and the coin

is the same as the size of the coin.

### Does the image of the coin appear larger or

smaller on her retina from further away?

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The image of the coin appears smaller on her

retina from further away.

### Does the size of the coin affect the size of

the image on her retina?

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Yes, the size of the coin affects the size of

the image on her retina.

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say at this distance, how large does the image of the coin appear

on her retina?, please leave your comment on this article.

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