A slit S is illuminated by a monochromatic suorce of light to give two coherent sources P1 and P2 . These give a dark band at the point R on the screen as shown in figure.
1. Write the formula to find out bandwidth.
2. What relationship must exist between the length P1 R and P2 R?
3. Can interference fringes be produced by using two identical bulbs?
4. If the distance between P1 and P2 is 1 mm and the screen is placed in 1m away, what is the fringe separation for a light of wavelength 5 × 10-7 m?