AP Physics 2 : Magnification
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Example Questions
Example Question #1 : Optics
An object 
The Magnification Equation is as follows:
The negative on the last part is very important. If you don't include it (and it's easy to forget), you will get the wrong answer.
We'll use the parts without 
Now, we can plug in our numbers.
Therefore, the image height is 
Example Question #1 : Magnification
You have a concave mirror and a candle. The candle is 
The magnification equation is
where 
The magnification is a scalar value, so it's unitless. We can verify this by examining what goes into the equation. Both heights have the same units, which cancel, so that leaves us with no units.
Example Question #1 : Magnification
The image produced by a concave mirror is at 
The equation for magnification is
We're given the image distance and the magnification, so we'd use the second equality.
Now, we can plug in our numbers.
The negative in front of the equation is very important. If you forget it, the answer will be incorrect.
The distance from the mirror to the object is 
Example Question #2 : Optics
An object of height 
None of these
Using the relationship:
Where:
Plugging in values:
Solving for 
Using the equation for magnification:
Where:
Example Question #5 : Magnification
You are passing a ray of light through a thin tank of alcohol to determine properties. Assume that the light ray is not effected by the tank's exterior. You find that if a piece of white paper is put underneath the alcohol tank, there is an image on the metal.
Assuming that the image is the size of 
To determine magnification, we simply divide the object length from the image length.
The negative sign is used to designate that the image is real.
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