# Math Help - minimum time

1. ## minimum time

show that the light waves traveling from P to Q follow the path of minimum time. i know i will be using velocity im jus not sure how, well attached is as far as i have gotten with this problem...i mean would i jus figure out the distance from P to Q and plug that into the formula for velocity, right?IMG.pdf

2. Originally Posted by slapmaxwell1
show that the light waves traveling from P to Q follow the path of minimum time. i know i will be using velocity im jus not sure how, well attached is as far as i have gotten with this problem...i mean would i jus figure out the distance from P to Q and plug that into the formula for velocity, right?IMG.pdf

3. $h1= d_1 cos(\theta_1)$ and $h2= d_2 cos(\theta_2)$ so the total distance from P to Q is $h1+ h2= d_1 cos(\theta_1)+ d_2 cos(\theta_2)$.