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In a Youngs double slit experiment, the slits are separated by $d = 0.28 \text{ mm}$ and the screen is placed $D = 1.4 \text{ m}$ away. The distance between the central bright fringe and the fourth bright fringe is $y_4 = 1.2 \text{ cm}$. When the apparatus is immersed in a liquid, the fourth bright fringe shifts to $y'_4 = 1.0 \text{ cm}$. Calculate the refractive index $\mu$ of the liquid.
- A.1.2
- B.1.44
- C.1.25
- D.1.33
Show correct answer & step-by-step solution
Correct answer: A — 1.2
Solution
The fringe width becomes in a medium. Thus, , which gives .
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