- 2

- 0

**1. Homework Statement**

If one light beam is heading toward you from the right, and another is heading toward you from the left, how quickly from the perspective of the right-moving beam is the left-moving beam approaching it?

1) 0

2) c

3) 1.5c

4) 2c

**2. Homework Equations**

(v+w) / (1 + cw/c2)

**3. The Attempt at a Solution**

I tried plugging in c into the equation for both v and w but it gives me (c + c) / (1 + c2/c2) which equals 2c. It is one of the possible answers but I know nothing can go faster than c so I'm thinking the answer is probably c. Am I right? If so, why? If not, what am I doing wrong?