1. A convex lens (f = 7.5 cm) is 29 cm from an object. This lens represents the
ID: 1285257 • Letter: 1
Question
1. A convex lens (f = 7.5 cm) is 29 cm from an object. This lens represents the cornea of an eye. Use the lens equation to find the image location of this lens. Correct: 10.1 cm. A second convex lens (f = 15.0 cm) representing corrective eyewear is now placed 5 cm in front of the "cornea" (between the "cornea" and the object) so that the image of the corrective lens becomes the object of the "cornea". (Note: This object distance should be negative since it is on the far side of the "cornea".) Calculate the image distance expected for the convex-convex lens system above. (Remember to account for the distance between the two lenses. The image distance for your answer should be measured from the center of the "cornea" lens, to make it easier to compare where the image would fall relative to the "retina" with and without the corrective lens.)
2. A convex lens (f = 7.5 cm) is 34 cm from an object. This lens represents the cornea of an eye.Use the lens equation to find the image location of this lens. Correct 9.62 cm.
A concave lens (f = ?15.0 cm) representing corrective eyewear is now placed 5 cm in front of the "cornea" (between the "cornea" and the object) so that the image of the corrective lens becomes the object of the "cornea". (Note: Based on the location of the image for the corrective lens, what should be the sign of the object distance for the "cornea"?)
Calculate the image distance expected for the concave-convex lens system above. (Remember to account for the distance between the two lenses. The image distance for your answer should be measured from the center of the "cornea" lens, to make it easier to compare where the image would fall relative to the "retina" with and without the corrective lens.)
Explanation / Answer
1/f = 1/u+1/v
1/7.5 = 1/27 + 1/v
v = 10.38 cms
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