Question 1
This question is about interference.
Light from a laser is incident on two identical parallel slits. The light from the two slits produces a fringe pattern on a screen.
A central bright fringe is produced at C . The next bright fringe is produced at A . There is a dark fringe at B .
The distance from the two slits to the screen is 1.5 m . The distance BC is 1.8 mm and the distance between the slits is 0.30 mm .
State the path difference, in metres, between the waves that meet at B .