Question

A thin mica sheet of thickness 4 x 10^-6 m and refractive index 1.5 is introduced in the path of the first wave. The wavelength of the wave used is 5000 A. The central bright maximum will shift ______.

विकल्प

• 4 fringes upward.

• 4 fringes downward.

• 10 fringes upward.

• 10 fringes downwards.

Answer 1

A thin mica sheet of thickness 4 x 10^-6 m and refractive index 1.5 is introduced in the path of the first wave. The wavelength of the wave used is 5000 A. The central bright maximum will shift 4 fringes upward.

Explanation:

Fringe shift,

`"W"_0 = "W"/ lambda("n"-1) "t"`

= `" W"/ (5000 xx 10^-10 ) (1.5 -1) xx 4xx 10^-6`

=4W

i.e., The central bright maximum will shift 4 fringes upwards.