A thin mica sheet of thickness `2 xx 10^(-6)` m and refractive index (`mu` =15) is introduced in the path of the first wave. The wavelength of the wave used is 5000 Å. The central bright maximum will shift

Options

A. 2 fringes upward
B. 2 fringes downward
C. 10 fringes upward
D. None of these

Answer

A