Coherent light that contains two wavelengths, 660 nm and 470 nm , passes through two narrow slits with a separation of 0.310 mm and an interference pattern is observed on a screen which is a distance 4.30 m from the slits. Required:
What is the distance on the screen between the first order bright fringes for the two wavelengths?

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?