STANDARD Physics Young's Double Slit Experiment MCQ Question
In a double slit experiment the angular width of a fringe is found to be 0.2° on a screen placed 1 m away. The wavelength of light used is 600 nm. The angular width of the fringe if entire experimental apparatus is immersed in water, is (Take μ_water = 4/3)
0.15°
1°
2°
0.3°
Correct Answer
Detailed Explanation
Since a fringe of width β is formed on the screen at distance D from the slits, the angular fringe width θ = β/D. If the wavelength in water is λ' and the angular fringe width is θ', then θ' = λ'/d = λ/μd. Therefore, θ' = 0.2° × 3/4 = 0.15°.
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