Posted by **Kelly** on Thursday, October 15, 2009 at 9:55pm.

i38. tinypic .c o m /2hnxvki .gif

In the experiment, the angles between the laser and the optical bench, θbench, and between the laser and the normal to the mirror, θmirror, are measured. What is the relationship between θbench and the customary angles?

A. θbench=r

B. θbench=r–i

C. θbench=i–r

D. θbench=i+r

E. None of the above

I know that it's not B or D. Any help is appreciated!

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