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According to question, 8th bright fringe in medium = 5th dark fringe in air. Calculate the refractive index μ.

1. μ = 1.5
2. μ = 1.6
3. μ = 1.78
4. μ = 1.9

Correct answer: μ = 1.5

Solution

The condition for bright and dark fringes involves the wavelength of light in the medium and air. Using the relation μ = (m_air + 0.5) / m_medium, where m_air = 5 and m_medium = 8, we get μ = (5 + 0.5) / 8 = 1.5.

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