Trigonometric Relationship for Light Passing Through a Slab

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Homework Statement
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Relevant Equations
pls see below
1677389722931.png

##\gamma = \theta_1 - \theta_2## where do you get that from?

Thank!
 
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Callumnc1 said:
##\gamma = \theta_1 - \theta_2## where do you get that from?
Uh ... simple trig. ##\theta_1 = \theta_2 + \gamma##
 
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phinds said:
Uh ... simple trig. ##\theta_1 = \theta_2 + \gamma##
Aah thank @phinds! Brain must have been dead, I see that now :)
 

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