5. ssm Two plane mirrors are separated by 120°, as the drawing illustrates. If a ray strikes mirror M1 at a 65° angle of incidence, at what angle q does it leave mirror M2?

 

w1312

 

The diagram below labels several angles so we can make equations to determine the angle q

Law of reflection means

 

 

 

 

 

 

 

Finally law of reflection again gives

 

 

 

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This page last updated on June 28, 2018