Physics Forums

Physics Forums (http://www.physicsforums.com/index.php)
-   Introductory Physics Homework (http://www.physicsforums.com/forumdisplay.php?f=153)
-   -   How do I find the height of the image? (http://www.physicsforums.com/showthread.php?t=302218)

phys62 Mar24-09 03:49 PM

How do I find the height of the image?
 
1. The problem statement, all variables and given/known data
A 1.80-cm-high object is situated 19.7 cm in front of a concave mirror that has a radius of curvature of 12.2 cm. Calculate (a) the location and (b) the height of the image.


2. Relevant equations
f=1/2R
1/image distance + 1/object distance = 1/f


3. The attempt at a solution
f=1/2(12.2) = 11.1
1/image distance + 1/19.7 = 1/6.1
image distance = 8.836 cm

then I thought to find the image height I'd just take 8.836 cm - 1.8 cm = 7.036 cm but this is incorrect.

jambaugh Mar24-09 06:01 PM

Re: How do I find the height of the image?
 
The ratio of image height to object height = the magnification will equal the ratio of distance from image over distance of the object to the mirror or lens.


All times are GMT -5. The time now is 10:09 PM.

Powered by vBulletin Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
© 2014 Physics Forums