NEET2019Physics-Wave Optics
NEET 2019 Physics Young's Double Slit Experiment MCQ Question
Type: MCQ-conceptual-Medium-Class 12
In a double slit experiment, when light of wavelength 400 nₘ was used, the angular width of the first minima formed on a screen placed 1 m away, was found to be 0.2°. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? (μwater = 4/3)
A
0.05°
B
0.10°
C
0.26°
D
0.15°
Correct Answer
Option D
Detailed Explanation
The angular width of the first minima is given by θ = λ/d. When immersed in water, the wavelength becomes λ/n. Thus, θ' = λ/(nd). The new angular width is 0.2°/1.33 = 0.15°.
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