Question

51. In a bi-prism experiment, when sodium light of
wavelength 5890 Å is used, then twenty fringes are
observed in 23 mm distance on screen. In order to
obtain 30 fringes in 28 mm of the interference pattern,
one should use light of wavelength:
(A) 4780 Å
(B) 6161 Å
(C) 8835 Å
(D) 4381 Å​

Answer 1

Answer:

c ...

Explanation:

C. 8835A° use light of wavelength