17. mmh A convex mirror has a focal length of - 40.0 cm. A 12.0-cm-tall object is located

40.0 cm in front of this mirror. Using a ray diagram drawn to scale, determine the (a) location and (b) size of the image. Note that the mirror must be drawn to scale.

 

The following diagram was done by hand on paper and then scanned to be placed it.  I am including equations after to verify the drawing.  Due to being scanned and copied, it may not be exactly the correct dimensions in the electronic or printed version now.

 

 

From the Mirror equation

Solve for image distance, i

 

 

 

Minus sign implies image is behind the mirror!  This is pretty close to the measured 19 cm!

We find height from

Solve for image height

 

 

The lack of minus sign indicates image is upright and this agrees with drawing which also got 6.0 cm!

 

 

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This page last updated on June 29, 2018