Homework Help: Relationship between angles

1. Nov 14, 2013

PintoCorreia

1. The problem statement, all variables and given/known data

It turns out there is a relation between angle a and angle b. I can't figure it out, could someone give me a hint?

There's a lightray that is bouncing from two mirrors (m1 and m2).

The angle between those two mirrors is called a.

The angle between the incoming lightray l1 and the mirror m1 is called x.

The angle between the incoming lightray l1 and the outgoing lightray l3 called b.

2. Relevant equations

incoming angle it outgoing angle

3. The attempt at a solution
I get stuck at the mathematical proof... Someone a clue?

2. Nov 14, 2013

Tanya Sharma

What are the given parameters ? Is 'x' a given quantity or some angle assumed by you ?

Look at the figure I have attached .Blue lines are normal lines to the two mirrors respectively.

What is ∠BAC in terms of x ?

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Last edited: Nov 15, 2013