STANDARD Physics Double Slit Interference MCQ Question
The two slits are 1 mm apart from each other and illuminated with a light of wavelength 5 × 10⁻⁷ m. If the distance of the screen is 1 m from the slits, then the distance between third dark fringe and fifth bright fringe is
1.2 mm
0.75 mm
1.25 mm
0.625 mm
Correct Answer
Detailed Explanation
The distance between the third dark fringe and the fifth bright fringe is calculated using the formula for fringe separation. For the third dark fringe, n = 3, and for the fifth bright fringe, n = 5. Using the formula, the distance is found to be 1.25 mm.
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