In Young's experiment, using red light ( =6600 Å), 60 fringes are seen in the field of view. How many fringes will be seen by using violet light ( =4400 Å) ?

Step-by-step solution

Using red light ( =6600 Å) 60 fringes are seen. Hence, range of field of view is 60 w=60 D d Using light of wavelength ^ , n fringes are seen, then aligned 60 D d & =n D ^ d 60 & =n ^ n=60 ^ & =60 6600 4400 =90 aligned