In a Young's double slit experiment using monochromatic light, the fringe pattern shifts by a certain distance on the screen when a mica sheet of refractive index 1.6 and thickness 1.964 microns is introduced in the path of one of the interfering waves. The mica sheet is then removed and the distance between the slits and screen is doubled. It is found that the distance between successive maxima now is the same as observed fringe shift upon the introduced of the mica sheet . Calculate the wavelength of the monochromatic light used in the experiment .

Explanation

To solve the problem, we will follow these steps:

### Step 1: Understand the problem
In a Young's double-slit experiment, we have a fringe pattern that shifts when a mica sheet is introduced. We need to calculate the wavelength of the monochromatic light used.

### Step 2: Define the parameters
- Refractive index of mica, \( \mu = 1.6 \)
- Thickness of the mica sheet, \( T = 1.964 \, \mu m = 1.964 \times 10^{-6} \, m \)
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