1. An object 1.7 cm high is held 3.1 cm from a person's cornea, and its reflected image is measured to be 0.142 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. iii) Do NOT do any calculations for this section. do cm ho = cm h; = cm (Include the appropriate sign for an erect or inverted image) (b) What is the magnification? M= (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. R= |cm (include the appropriate sign) 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.

1. An object 1.7 cm high is held 3.1 cm from a person's cornea, and its reflected image is measured to be 0.142 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. iii) Do NOT do any calculations for this section. do cm ho = cm h; = cm (Include the appropriate sign for an erect or inverted image) (b) What is the magnification? M= (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. R= |cm (include the appropriate sign) 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.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Applications Of Reflection Of Light

When a light ray (termed as the incident ray) hits a surface and bounces back (forms a reflected ray), the process of reflection of light has taken place.

Sign Convention for Mirrors

A mirror is made of glass that is coated with a metal amalgam on one side due to which the light ray incident on the surface undergoes reflection and not refraction.

Question

1. An object 1.7 cm high is held 3.1 cm from a person's cornea, and its reflected image is measured to
be 0.142 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.
iii) Do NOT do any calculations for this section.
%D
cm
ho
cm
h; =
cm (Include the appropriate sign for an erect or inverted image)
(b) What is the magnification?
M=
(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.
V 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.
IL ||

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