NEET2018Physics-Wave Optics
NEET 2018 Physics Young's Double Slit Experiment MCQ Question
Type: MCQ-conceptual-Medium-Class 12
In Young’s double slit experiment the separation d between the slits is 2 mm, the wavelength λ of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same λ and D) the separation between the slits needs to be changed to
A
1.8 mm
B
1.9 mm
C
2.1 mm
D
1.7 mm
Correct Answer
Option B
Detailed Explanation
The angular width of the fringes is inversely proportional to the slit separation. To increase the angular width, the slit separation should be decreased.
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