NEET UG PHYSICS MCQ: WAVE OPTICS

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Using Young's double slit experiment, a monochromatic light of wavelength

5000\mathop {\text{A}}\limits^{\text{o}}

produces fringes of fringe width

0.5 \mathrm{~mm}

. If another monochromatic light of wavelength

6000\mathop {\text{A}}\limits^{\text{o}}

is used and the separation between the slits is doubled, then the new fringe width will be :

View answer and explanation

Correct option: D

0.3 \mathrm{~mm}

Option C (

0.6 \mathrm{~mm}

) is correct because the fringe width is directly proportional to the wavelength and inversely proportional to the slit separation; doubling the slit separation and changing the wavelength results in a new fringe width of 0.6 mm.

NEET UG PHYSICS MCQ: WAVE OPTICS

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