Read the passage below and answer the following questions in this context.

YDSE is abbreviation used for Young's Double Slit Experiment. YDSE shows interference of light. Interference of light is the phenomenon where two light waves meet each other while travelling in the same medium. A light source is kept behind a wall where two slits are made : S1 and S2. On the screen, there appears a pattern of alternate bright and dark fringes. The central fringe is always bright. 

The distance between 5th and 4th bright fringe is 4786 Aº. What is the difference between 2nd and 4th bright fringe?

 9572 Aº

Distance b/w two adjacent bright fringes remains equal.