• Support PF! Buy your school textbooks, materials and every day products via PF Here!

How do I find the height of the image?

  • Thread starter phys62
  • Start date
53
0
1. Homework Statement
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. Homework 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

Science Advisor
Insights Author
Gold Member
2,162
219
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.
 

Related Threads for: How do I find the height of the image?

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top