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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
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.

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