In a certain region A to B in a thin film, we get 10 fringes in the reflected beam of wavelength 4200 A.U. How many fringes will be observed in the same region with 6000 AU?
logical question
if it makes 10 fringes in 4200A.U. then in 6000A.U. wavelenth it wil make 15 fringes .
if u hv doubt tat y nt 24 bcos d A.U. value is nt double of first A.U and more than 10 we need so option 1 and 3 are wrong .