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An object 1.7 cm high is held 3 cm from a person's cornea, and its reflected image is measured to be 0.157 cm high. Think & Prepare: 1. What kind of mirror is the cornea, convex or concave? 2. What kind of mirror causes magnification? 3. What kind of image is it? 4. What signs will the different quantities have? (a) Set-up the table for some known quantities. i) Make sure to use the correct sign for the image distances, object distances, and the focal lengths. ii) Make sure to use the correct sign for the image and object heights. Inverted object and image heights are negative. d₁ = = iii) Do NOT do any calculations for this section. h;= (b) What is the magnification? M= cm cm cm (Include the appropriate sign for an erect or inverted image) (c) Where is the image? d;= cm (include the appropriate sign) (d) Find the radius of curvature of the convex mirror formed by the cornea. cm (include the appropriate sign) R = Note that this technique is used by optometrists to measure the curvature of the cornea for contact lens fitting. The instrument used is called a keratometer, or curve measurer.

An object 1.7 cm high is held 3 cm from a person's cornea, and its reflected image is measured to be 0.157 cm high. Think & Prepare: 1. What kind of mirror is the cornea, convex or concave? 2. What kind of mirror causes magnification? 3. What kind of image is it? 4. What signs will the different quantities have? (a) Set-up the table for some known quantities. i) Make sure to use the correct sign for the image distances, object distances, and the focal lengths. ii) Make sure to use the correct sign for the image and object heights. Inverted object and image heights are negative. d₁ = = iii) Do NOT do any calculations for this section. h;= (b) What is the magnification? M= cm cm cm (Include the appropriate sign for an erect or inverted image) (c) Where is the image? d;= cm (include the appropriate sign) (d) Find the radius of curvature of the convex mirror formed by the cornea. cm (include the appropriate sign) R = Note that this technique is used by optometrists to measure the curvature of the cornea for contact lens fitting. The instrument used is called a keratometer, or curve measurer.

University Physics Volume 3
University Physics Volume 3
17th Edition
ISBN:9781938168185
Author:William Moebs, Jeff Sanny
Publisher:William Moebs, Jeff Sanny
Chapter2: Geometric Optics And Image Formation
Section: Chapter Questions
Problem 37P: An object 1.50 cm high is held 3.00 cm from a person’s cornea, and its reflected image is measured...
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An object 1.7 cm high is held 3 cm from a person's cornea, and its reflected image is measured to be 0.157 cm high. Think & Prepare: 1. What kind of mirror is the cornea, convex or concave? 2. What kind of mirror causes magnification? 3. What kind of image is it? 4. What signs will the different quantities have? (a) Set-up the table for some known quantities. i) Make sure to use the correct sign for the image distances, object distances, and the focal lengths. ii) Make sure to use the correct sign for the image and object heights. Inverted object and image heights are negative. d₁ = = iii) Do NOT do any calculations for this section. h;= (b) What is the magnification? M= cm cm cm (Include the appropriate sign for an erect or inverted image) (c) Where is the image? d;= cm (include the appropriate sign) (d) Find the radius of curvature of the convex mirror formed by the cornea. cm (include the appropriate sign) R = Note that this technique is used by optometrists to measure the curvature of the cornea for contact lens fitting. The instrument used is called a keratometer, or curve measurer.
Transcribed Image Text:An object 1.7 cm high is held 3 cm from a person's cornea, and its reflected image is measured to be 0.157 cm high. Think & Prepare: 1. What kind of mirror is the cornea, convex or concave? 2. What kind of mirror causes magnification? 3. What kind of image is it? 4. What signs will the different quantities have? (a) Set-up the table for some known quantities. i) Make sure to use the correct sign for the image distances, object distances, and the focal lengths. ii) Make sure to use the correct sign for the image and object heights. Inverted object and image heights are negative. d₁ = = iii) Do NOT do any calculations for this section. h;= (b) What is the magnification? M= cm cm cm (Include the appropriate sign for an erect or inverted image) (c) Where is the image? d;= cm (include the appropriate sign) (d) Find the radius of curvature of the convex mirror formed by the cornea. cm (include the appropriate sign) R = Note that this technique is used by optometrists to measure the curvature of the cornea for contact lens fitting. The instrument used is called a keratometer, or curve measurer.
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