Using scallops to correct vision
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Using scallops to correct vision
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[post_date] => 2025-01-09 21:32:42
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[post_content] => Practice Passage (Question 1-5)
*This passage is the property of Khan Academy and has been reformatted into an AAMC-style interface in their entirety by MedLife Mastery. MedLife Mastery does not endorse and is not an affiliate of Khan Academy.
The human eye focuses light using its lens, which alters the path of light so that the image is produced on the retina. Scallops, a type of saltwater clam, has numerous eyes that similarly have a lens and retina. However, the distance between the two structures is negligible, which makes it impossible for the lens to focus light on the retina. This issue is circumnavigated by the fact that past the retina, scallops have a structure called an argentea, which is a type of spherical mirror. This mirror reflects the light back on the retina, effectively providing enough space for the lens to fulfill its function.
A researcher is interested in synthesizing an artificial argentea for patients suffering from axial hyperopia, in which the eyeball is too small, resulting in the image focusing behind the retina. In a laboratory setting, she investigates the properties of the images created by a miniature curved mirror. The lab set up consists of a curved parabolic mirror that is reflective on both sides and table upon which a light source can be placed at different distances from the mirror on either side. The lab set up is shown in the diagram. The point 3 represents the center of curvature of the curved mirror. The point 4 represents the focal point of the curved mirror.
Figure 1. The laboratory setup the researcher is using.
[post_title] => Using scallops to correct vision
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[question] => Which of the following light source locations would create the smallest possible real image?
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[answer] => 1
[description] => Reason for the Correct Answer:
Only positions further from the mirror than the focal point will create real images
Only positions on the concave side of the mirror can create real images
Being further from the mirror will create a smaller image, so point 1 will create the smallest real image
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[answers] => Array
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[0] => Array
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[each_answer] => A. 1
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[1] => Array
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[each_answer] => B. 2
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[2] => Array
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[each_answer] => C. 5
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[each_answer] => D. 8
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[1] => Array
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[quiz_unique_key] => 3873426850
[question] => Which of the following candle locations would not create a clear image?
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[answer] => 2
[description] => Reason for the Correct Answer:
The convex side of a mirror will always make an image
The rays from an image placed at the focal point will emerge parallel to each other, and therefore will not create a clear image.
Since the focal point is 4, that is the location where a candle will not make a clear image
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[answers] => Array
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[0] => Array
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[each_answer] => A. 3
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[each_answer] => B. 4
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[each_answer] => C. 5
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[each_answer] => D. 8
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[quiz_unique_key] => 83407773
[question] => Which of the following candle locations would not create a virtual image?
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[answer] => 1
[description] => Reason for the Correct Answer:
The convex side of a mirror will always make a virtual image
The rays from an image placed at the focal point will emerge parallel to each other, and therefore will not create an image.
Since the focal point is 4, that is the location where a candle will not make a virtual image
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[answers] => Array
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[0] => Array
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[each_answer] => A. 4
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[each_answer] => B. 5
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[each_answer] => C. 6
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[each_answer] => D. 8
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[quiz_unique_key] => 2377279144
[question] => Which of the following candle locations would create the largest virtual image?
[value] => Array
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[answer] => 1
[description] => Reason for the Correct Answer:
A concave mirror creates virtual images that are larger than the object
The virtual images created by a convex mirror smaller than the object
Since point 5 is a virtual image created by a concave mirror it will be larger than the images created by the convex side of the mirror
)
[answers] => Array
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[0] => Array
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[each_answer] => A. 5
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[each_answer] => B. 6
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[2] => Array
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[each_answer] => C. 7
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[3] => Array
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[each_answer] => D. 8
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[quiz_unique_key] => 2261298308
[question] => If you moved the candle location from point 8 to point 6 what would be seen to happen to the size of the image?
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[answer] => 3
[description] => Reason for the Correct Answer:
The object is on the convex side of the mirror the whole time
Try drawing a ray diagram for an object far away from a convex mirror, and compare to a ray diagram for an object close to a convex mirror
Getting closer and closer to a convex mirror will cause the image to consistently get larger
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[each_answer] => A. The image would be seen to get consistently smaller
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[each_answer] => B. The image would be seen to get smaller then larger
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[each_answer] => C. The image would be seen to get consistently larger
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[each_answer] => D. The image would be seen to get larger then smaller
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