16.
In Young's double slit experiment the slits are separated by 0.5 mm and screen is placed 1.5 m away. The distance between the central bright fringe and the fifth bright fringe is 1.5 cm. What is l?
Suggested solution:
The distance between the central and the 5th bright fringe = 1.5cm
Therefore b = 0.3 = 3 x 10-3 m. Also
given d = 0.3 mm = 3 x 10-4 m, D = 1.5 m
= 6 x 10-7m
= 600 nm.