NEET2014Physics-Wave Optics
NEET 2014 Physics Diffraction MCQ Question
Type: MCQ-numerical-Medium-Class 12
A beam of light of λ = 600 nₘ from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is
A
1.2 cm
B
1.2 mm
C
2.4 cm
D
2.4 mm
Correct Answer
Option C
Detailed Explanation
The distance between the first dark fringes is given by the formula: 2λL/a, where λ is the wavelength, L is the distance to the screen, and a is the slit width. Substituting the given values, we get 2 * 600 * 10⁻⁹ m * 2 m / 1 * 10⁻³ m = 2.4 * 10⁻² m = 2.4 cm.
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