question_answer 4)

In a Young's double-slit experiment, the slits are separated by 0.28 mm and the screen is place 1.4 m away. The distancebetween the central bright fringe and thefourth bright fringe is measured to be 1.2cm. Determine the wavelength of light usedin the experiment. 

Answer:

Here, d = 0.28 mm == 0-28 x 10-3 m D = 1.4 m, n = 4 and From the relation,