Please type your LAST NAME and LAST FOUR SS# digits (eg: Smith3256):
I received no help from anyone on this assignment.
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WarmUp questions are worth 4 points each towards your "Homework and Web Assignments" score (250 points total).
The focal length of a plane mirror is
Undefined
Zero
One
Infinity
None of the above
You may change your mind as often as you wish. When you are satisfied with your responses click the SUBMIT button.